Bibtex parsing: Don't lowercase citation ids.
Bibtex parser: Allow _ and digits in field names.

These aren't in standard bibtex fieldnames, but some external
programs use them.
Bibtex parsing: get "howpublished" with getField, not getLiteralList.
Bibtex:  Parse options field, make name parsing sensitive to useprefix.

If useprefix is true, then prefix becomes a nondropping particle.
Otherwise it's a dropping particle.
Bibtex parsing:  Map "location" -> "jurisdiction" for patents.

Also resolve biblatex keys.
Bibtex parsing:  Map "library" to callNumber.
Bibtex parsing:  Add period btw note and addendum (if not already).
Bibtex parsing: convert -- to - in pages for uniformity.