Minor documentation improvement
Update CHANGES.txt
Add gerarda to scripts
Specify time zone in GeoTIFF TIMESTAMP

In order to properly calculate hourly evaporation, gerarda really needs
to know the time the data refers to, including the time zone. Bitia was
changed to add this information, and gerarda was changed to display an
understandable error message whenever this doesn't happen.
Have bitia store time zone in output files

Bitia outputs GeoTIFF files that have a TIMESTAMP gdal metadata item;
this now contains a time zone (if the input files to bitia specified
one); this is necessary for subsequently calculating evaporation with
gerarda.
Restore but deprecate timeseries.datetime_from_iso

timeseries.datetime_from_iso was removed in e86687f11 in favour of
iso8601.parse_date(). We bring it back, but deprecate it, for backwards
compatibility purposes (Enhydris still uses it).
Have fordonia store time zone in output files

Fordonia did not store the time zone in the output file; now it does,
provided the input file specifies one.
Have TzinfoFromString parse UTC+XXXX

TzinfoFromString was parsing +XXXX or any string containing brackets
containing +XXXX, but would fail on UTC+XXXX. This was fixed. In
addition, a number of tests were added for TzinfoFromString.
Merge pull request #9 from kickapoo/master

Fix error in error message
Load dickinson on Mac OS X

On Mac OS X, dickinson is libdickinson.dylib, not libdickinson.so.
Merge branch 'master' of github.com:openmeteo/pthelma
More Mac OS X fixes