works started on Fernadez based compton scattering
xmi_db updates completed

now read procedures need to be updated
xmi_init_from_hdf5 updated for new compton profiles
Brute force implemented

Still testing but it looks good
variance reduction support added

still slow because of findpos..
speed dramatically improved but still too slow

will look into making this an optional feature
new compton made optional

cli tools adapted to new feature, now gui
gui updated
compton fluorescence brute force

untested
variance reduction compton fluorescence
Merge branch 'master' into compton-improvements
bugfix
improved escape ratios procedure

Starting with this commit, we transition to a combined variance
reduction -- brute force approach.
The variance reduction will be used for the steplength determination of
the interaction, as well as for the fluorescence yield of the X-ray
fluorescence processes (note: all PE interactions lead to fluorescence
because of this!).
After the first interaction, the brute force steplength determination
will be used to see if the photon ends up outside the detector.

There was also some code cleanup: I removed the useless
--enable-optimizations option
new function xmi_get_escape_ratios_options

defined new struct xmi_escape_ratios_options in order to set the
parameters for the escape ratio calculation
minor change in xmi_detector_escape

no more hard exit when input energy is out of range, just ignored now
header information added
some fixes
version req bump for escape ratios HDF5 file
xmi_escape_ratios_calculation has its own main options now
Merge branch 'escape-improvements'

After doing some escape ratios calculations for Andreas, it turned out
that the accuracy of the ratios dropped significantly when the
transmission of the photons was high. So I came up with an alternative
based on a combined brute-force/variance-reduction approach, which
produces uniform escape ratio fluctuations across the entire energy
range. It's slower though...