fix and make it a bit more flexible
* rcs_getctime is changed, now rather than needing to loop over all pages,
it should just use the rcs to get the ctime of the passed file.
to pave the way for adding other RCS support. This also changes the
setup files, where before they had svn => 1 or svn => 0, now they have
rcs => "svn" or rcs => "".
* Add a debian/NEWS file with upgrade notes.
* Load whatever rcs module is specified, so new ones can be just dropped in
as plugins and work.
* Add some basic docs about writing RCS modules.
joey