Fixed issue #105 ('FileNotFoundError: Options file not found ...' when running...

Fixed issue #105 ('FileNotFoundError: Options file not found ...' when running run_gms.py -h after installing gms_preprocessing from pip or conda-forge.).

Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>
3 jobs for enhancement/improve_docs in 9 minutes and 44 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Test
failed #50856
test_gms_preprocessing

00:09:22

63.0%
passed #50857
test_styles

00:00:21

 
  Deploy
skipped #50858
pages
 
Name Stage Failure
failed
test_gms_preprocessing Test
make: *** [Makefile:75: nosetests] Error 1
Uploading artifacts for failed job
Uploading artifacts...
htmlcov/: found 48 matching files and directories

WARNING: docs/_build/html/: no matching files
nosetests.html: found 1 matching files and directories

nosetests.xml: found 1 matching files and directories

Uploading artifacts as "archive" to coordinator... ok
id=50856 responseStatus=201 Created token=3G-m5tHx
ERROR: Job failed: exit code 1