[Zope] LocalFS updated for Zope 2.3.0

[Jonothan Farr]

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