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- changecom and changequote have a simple definition (that matches gnu-m4,
coincidentally, so we no longer need two distinct modes for these)
- off-by-one bug in -s, this finally works.
- reorder main parser loop, so that we can use alphabetic constructs in
quotes/comments.
- rename putback to pushback, this matches comments, and makes more sense.
- more uniform (and updated) description of changequote/changecom.
- new, systematic regression tests of comments/quotes.
- framework to test -s: one perl script to reconstitute `full' files with
all line numbers, so that we can verify the output without needing a
complete match.
okay otto@, fries@
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