Unicode support for study_parser.py

[dominikl]

The study_parser.py doesn't work with unicode characters. We should look into that. Hopefully won't be hard to fix, as the metadata plugin for example works fine with unicode.

For example if the study file contains an umlaut you'll get:
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xfc in position 2515: invalid start byte

[sbesson]

@dominikl agreed it would be good for the parser to just do the right thing for any incoming study file. Immediate thought would be to try and force the encoding in

idr-utils/pyidr/study_parser.py

Line 105 in 334968d

with open(self._study_file, 'r') as f:

Otherwise, we could look at an example file.