ignore .prove
ignore Puppet backups
ignore TAG_EDITMSG
compute regexps for datafiles for performance
improve perf by using optimized datafile regexps
ignoramus-boring-p up to 4x faster
only compare one-by-one for exact hit if regexp matches
don't pre-compute a case-folded filename (perf)
let the optimzed regexp do most of the work.  compare-strings
is slower, but only called in case of hit.
allow passing an explicit basename for perf
allow marking files as expanded for perf
doc/comment
whitespace