attempt to load cross-reference database.
produce compressed PDF
parse tex % comments
parse \crossref tag and collect cross-reference information.
more work on cross-reference reading.
fix parsing of \allowbreak LaTeX tags.
make Jude all chapter 0 to make life easier for crossreference
manager.
switch back from crossreference mode after each
cross reference has been read.
display contents of typeface stack if stack is overflowed.
actually exit crossreference mode at the end of a cross-reference