[Zope] SiteAccess 2.0.0 beta 2

Jacques A . Vidrine discovered a chunk of code I accidentally left where it didn't belong, which messed up the adding of SiteRoots. I've uploaded v2.0.0b2 to zope.org, but if you've already downloaded beta 1, you can fix your installation by just editing SiteRoot.py and deleting the lines of method manage_afterAdd after the call to BeforeTraverse.registerBeforeTraverse. Then you can either delete and re-add the SiteRoots, or run the upgrade script again. Cheers, Evan @ digicool & 4-am