Add support for biblatex field aliases

[koppor]

In the biblatex documentation at Section 2.2.5, "Field Aliases" are described.

• address for location
• annote for annotation (jurabib)
• archiveprefix for eprinttype (arXiv)
• journal for journaltitle
• key for sortkey
• pdf for file (JabRef compatibility ☀️)
• primaryclass for eprintclass (arXiv)
• school for institution

Issue: When switching from bibtex to biblatex mode, the field "journal" is written as optional field, even though it is a required field.

quick hack

In the serialization of JabRef, aliased fields should be treated like the original fields.

Issue with the quick hack: The aliased field is still treated as optional field or not treated at all. This seems to be inconsistent.

related bug reports

• support for journal alias. Reported to be resolved somehow in "JabRef v2.11 beta"

[cbersch]

The related bug report on sf isn't relevant, since this was only about the mere possibility to use the journaltitle field at all. It didn't try at all to handle field aliases properly.

[koppor]

We have some support in the entry table: #24 and some code has been written for the journaltitle field: #1720 and #15

The entry editor, however, still does not support alias and this causes issues when fetching entries: #2209

[tobiasdiez]

This is now implemented in the latest development version (at least if I understand it correctly). Could you please check the build from http://builds.jabref.org/master/. Thanks!