Merge a variant of Shadow Copy module for exposing snapshots to windows clients as...

Merge a variant of Shadow Copy module for exposing snapshots to windows clients as shadow copies from Samba 3.0 CTDB

This is a 2nd implemetation of a shadow copy module for exposing
snapshots to windows clients as shadow copies. This version has the
following features:

     1) you don't need to populate your shares with symlinks to the
     snapshots. This can be very important when you have thousands of
     shares, or use [homes]

     2) the inode number of the files is altered so it is different
     from the original. This allows the 'restore' button to work
     without a sharing violation

Signed-off-by: Alexander Bokovoy <ab@samba.org>