doc: fix regexp for determining the man page section
Preceding a .* pattern with an other dot serves little purpose,
better anchor the regexp to the start of the file name.
Fix test-convert-cvsnt-mergepoints so it works reliably.
Specifically, always run 'cvs commit' with -f option to force commit;
add one strategic sleep which seems to be necessary for post-merge
clobber-and-commit (-f doesn't force a commit there?).