If preformat lines are unbalanced, do not delete all the lines from there to
end of file. That might be the only copy of edits made by the user.
Do not print entire file contents for munge errors affecting entire file.
The basic idea is that in the main mungedocs we run the entirefile and
create an annotated set of lines about that file. All mungers then act
on a struct mungeLines instead of on a bytes array. Making use of the
metadata where appropriete. Helper functions exist to make updating a
'macro block' extremely easy.