src/dump3d.c: Report img_STOP as STOP rather than CODE_0xffffffff.
lib/po-to-msg.pl: Fix matching quote check to really allow
for using « and » in a translation.
lib/survex.pot,src/dump3d.c: Add --show-dates/-d to --help output.
lib/Makefile.am: Remove launchpad-tarball target - changes now
get picked up by launchpad automatically via a bzr mirror of the
git repo.