Minor edits to README.md file
Committing all changes for 5.2 to date (v5.1.0)

This massive commit comes after the problem with my laptop, which
caused the repository to loose alignment of the latest code (committed to v5.2.0)
From now on, all changes will be committed individually.

 * Added: Analytic spectra correction after Massman (2000, 2001)

 * Refinement: improved format and function calls related to exception handling

 * Refinement: in "filelist_by_ext", anticipated exception handling if no
   files are found in folder

 * Refinement: corrected the spelling of subroutine ShrinkString

 * Refinement: eliminated useless output 'Verifying time series
   integrity' during planar fit data import

 * Refinement: eliminated useless "+1" on both sides of a "greater
   than" test, in subs importing SLT files

 * Refinement: eliminated N = N - 1 at the end of sub ReadSLTEddySoft

 * Refinement: proper setting of FileEndReached in ReadSLTEddySoft and
   ReadSLTEdisol

 * Refinement: in timelag optimization session and in main raw data
   processing session, moved call to retrieve_sensor_params before timelag
   estimations to have instruments properties available for appropriate
   "starting timelags" definition.

 * Refinement: adjusted algorithms to calculated default timelags, which
   now include "tube time", "cell time" and a fixed delay for data
   collected through the LI-7550 interface unit. This refinement also
   implied:
   - Redefinition of timelag optimization variables structure (now
     "%min_tlag(GHGNumVar)" replaces gas-specific variables such as
     "%co2_min_lag". The same for the "max" timelag.
   - Code simplification with a cycle over the 4 gases instead of
     separate blocks of codes for defining the min/max/nominal timelags

 * Refinement: eliminated squared root operating on the transfer
   function H, in the Fratini et al. (2012) spectral correction method

 * Refinement: eliminated useless "+1" on both sides of a "greater than" test,
   in subs importing all binary files (TOB1, generic binary)

 * Refinement: moved 'normal exit instruction' in all subs importing raw
   data, in such a way that the exception of reaching the end of the file
   is caught in most (possibly all) occasions.

 * Refinement: improved control over missing lines, with an additional
   control after statistical screening, so that period is skipped if not
   enough data remain after the screening, also including native missing
   data such as -9999.

 * Fixed: functioning of metadata retriever, that got broken after
   refactoring for 5.0. This required some seemingly major scrambling
   in the main file of RP, but those are actually minor adjustments

 * Refinement: revised retrieval of files in list, to safely skip
   files that do not comply the raw file name format.

 * Refinement: moved function NameMatchesTemplate into src_common/dir_sub.f90 file.

 * Fixed: call to CorrectionFactorsIbrom07 in BPCF_Fratini12. The wrong call
   prevented use of backup solution (Ibrom model) in periods of too-low
   fluxes. So, the correction was always using the direct method of Fratini
   et al. 2012, also in low-flux conditions.

 * Fixed: module call to m_common_global_var in RenameTmpFilesCommon. The
   bug was not causing problems because the same module is called by the
   module that was mistakenly called

 * Technical: Removed the usage of auxiliary folder ..\mod in both RPP and
   FCC projects, to ease and streamline the port to other OS.

 * Refinement: Simplified ShowDailyAdvancement and introduced advancement
   marks on output, to allow for GUI estimate of processing time

 * Fixed: bug causing cross-wind correction to be applied to 'fast
   temperature' measurements, but only if those were used in conjunction
   with an R2 anemometer.

 * Refinement: revised the text displayed when running engines with option -h

 * Refinement: in case of space separation in raw file with
   non-numeric field, defaults to considering multiple consecutive
   separations as only one.

 * Refinement: calculation of cutoff frequencies and dependence
   cutoff/RH when data for very few RH classes are available

 * Refinement: completely rewritten subroutine to import full cospectra
   and modified approach in FCC to get the size of cospectra from the
   first file instead of allocating in advance

 * Moved definition of 'null' spectra from fx to common module

 * Refinement: implementation of random error after Finkelstein and Sims (2001):
   - Improved code quality and readability
   - Dramatically improved speed in calculating the ITS
   - Started to include method of Billesbach, 2011

 * Fixed: exit condition for subs importing ASCII data. Was crashing in some conditions,
   if a file contained more records than expected.

 * Fixed: bug causing off-season uptake correction to
   switch to 'simple linear' and stick there, if
   radiation measurements were missing for just one half-hour.

 * Fixed: management of external biomet files (1 file,
   files in folder, 1 minute time-step).

 * Fixed: bug causing soil temperature not to be duly treated as a biomet variable

 * Fixed: bug causing TOB1 files without header (rare case) to be deleted from the data folder,
   if they happened to contain less data than expected.

 * Added: option to run engine with command-line specificied .eddypro file (full path)

 * Added: eddypro_rp now edits .eddypro file, so that eddypro_fcc can be
   launched when eddypro_rp completes, without intervention of the GUI
Eliminated old, unused files
Uncommented lines

Lines were commented for testing different ITS calculations
Deleting old, useless file
Small adjustments after massive merging
Cleaning up project files
New command line option -c --caller

 * Added: new command line option (-c, --caller) to recognize if run
   is performed through the GUI ('gui') or from the command line ('console').
   Default is 'console'.

 * Refinement: advancement of planar-fit and time-lag optimization
   now depends on --caller option. This helps the GUI define the behaviour
   of the command line while having a pretty output when running from
   console
Modified help to include new option -c
Refined daily and period advancement display

Harmonized messages and subroutines in both rp and fcc
Cleaned console output for timelag optimization

 * Eliminated redundant messages in case biomet files are used
Cleaned console output a very little bit
Implemented independent behavior for biomet output

 * Now biomet data are output even if corresponding high-freq data
   are not available. It should work with both embedded and
   external biomet files
Minor irrelevant changes to drift correction

 * These changes will anyway be overridden by
   implementation going on on separate branch
Minor edits

 * Changed name of a subroutine and its calls

 * Added IFFT routine for future use (also from FFTPACK)
Implemented changes to GHG-Europe otuput format

Changes were requested by the European Database managers (Dario Papale)

 * Eliminated raw file name from output strings

 * Added ISO basic format timestamp

 * Eliminated Pa, Ta, RH from file to avoid conflicts with meteo files
Just shortened lines length in random_error_handle
version and data update
changed complilation settings for rfftb
version and data update