This allows using certain escape sequences, such as \", in titles and authors of
bibtex files.
Titles are wrapped titles with 'exact-chars, so the set of escapes handled is
large.
A different method is used for author which basically convert certain well-known
escapes into Unicode.
This seems necessary to support parsing of author names.
Handle comma-separated Last,First and Last,Jr,First format for names in bibtex, as well as "von", "de la", "van de", and other separators that start with lowercase letters
