Handle duplicate author field (for BibTeX input)

[Jannik Schürg]

Hi,

first, thanks for pybtex! :-) I have spent the last week customising it and the code is really nice to read.

I noticed that having a duplicate author field in a bibtex entry results in the authors from both fields getting concatenated. Arguably a duplicate field should not happen. In this case I propose to use the value from the first field. Checking with bibtex gives

Database file #1: test.bib
Warning--I'm ignoring entry_name's extra "author" field

If you like I can try to implement this. My starting point would be database/input/*.py and there the process_entry method.

[Andrey Golovizin]

Yes, duplicate fields should be ignored with a warning by default and produce an error in the strict mode (pybtex --strict). You can modify .process_entry() and use .handle_error() to report the warning / error.

[Andrey Golovizin]

Merge branch 'jannschu/master'

Fixes #95.

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