don't do crazy cvs directory validation for project admins

all the crazy validation on the "CVS directory" field (e.g. to match the project type, the project short name, etc) is sometimes a hinderance: http://drupal.org/node/107980. instead of trying to special case that, or add yet more d.o-specific hacks and local patches, i'm now in favor of just ignoring those validation checks entirely if the user has 'administer projects' permission. as with http://drupal.org/node/108109 (and many other places), once you have 'administer projects' perms, we assume you know what you're doing. ;)

i have a patch, but it touches so much of the same code as http://drupal.org/node/108109 and http://drupal.org/node/108110 that i'll just wait until i commit those and post the (very small) patch that makes this work.