Change name from cinelerra-2.2CV to cinelerra-cv-2.2.

Use the same name on the tarball and gettext domain as the DNS name for
the project, ie "cinelerra-cv" and not "cinelerra".  This also bring the
tarball name in sync with the debian package build rules.
Updated po files to match current set of strings.

Ran 'make -C po update-po', to make sure the pot and po file
reflect the current set of strings in the program.
Add pot file to make it easier to track changes in the strings.
Changed name to Cinelerra-CV on all program messages
Make compatible with clang.

Add libstdc++ to library list and disable unused mmx detection code that do not
build with clang (invalid inline assembly).
Get -O0 builds working too.
Merge git://git.cinelerra-cv.org/CinelerraCV
Build with clang too now that it is working.