Use new target release-checks in place of verify-version-debian,
verify-version-python verify-version-manpage. This target executes
devel/release-checks.sh which does all the verifications the three
dropped targets did, and some more.
These functions are enough different in their behavior that it's not
really worth it to combine them. They overlap in the format of the
dump file, but we can have a separate page that describes the dump
format, and either reference it or include it. This also keeps things
nice and clean with one page per command.
- We have to remove the installation of notmuch.1.gz from the top
level Makefile.local.
- Man pages with multiple names are handled by making relative
symlinks in the install-man target.
- update version tests and convenience rules for split man pages
The man page version test still only checks notmuch.1, but the
location is updated.
update-man-versions is longer than the one-line previously in
update-versions mainly because I decided to take the high road and
stick to POSIX sed (thus, no sed -i). The sed regex itself is more
complicated to cope with variations in the headers.
