Issues:
	- common framework

cds-tag
cds-version
cds-log
cds-annotate
cds-init
cds-checkout
cds-mv
	- check to make sure we have to args
cds-diff
	- diff of removed file doesn't work



Multi-VCS support:
==================

It is fairly trivial to have the 'cds-foo' file evaluate the VCS_FOO
variable (set in 'cds'). This way, simple commands can just invoke the
actual vcs command, while the harder to implement ones can just call a
function within cds itself. This would turn cds-* into something very
simple, and it may make sense to completely eliminate these very simple
files and call the executables/functions directly in cds. This would make it
impossible to support the dual way of calling the scripts (with a space or a
dash).