[Zope] LocalFS updated for Zope 2.3.0

Finally! http://www.zope.org/Members/jfarr/Products/LocalFS Mainly this just fixes the problem with an AttributeError in bobobase_modification_time(). Several good patches were submitted by LocalFS users and for that I am grateful. I believe this was the best of the ones submitted, because the management interface shows the actual modification time of LocalFS objects in the ZODB, as I believe it should. Local files and directories still show their modification time from the local file system. Thanks for all the great patches! --jfarr