vchoi_fork

[svn-r12906] Description:
    Straighten out some convoluted code when links were being deleted, which
could cause the "delete" callback for user-defined links to not get called when
the group they were in was deleted.

    Had to compromise on the "delete" callback though - only calls the callback
with the ID for the file the link is in, instead of the group, since the group
is being held open upstream in the calling sequence during a group deletion and
this prevents a group and its ID from being created.  (This could possibly be
worked around, but would cause a fair bit of havoc in the code and I'm not
entirely certain it's worth it...)

Tested on:
    Linux/32 2.6 (chicago)