For bug #81097, detect and report suspicious hardlinks to suid/sgid files. False...

For bug #81097, detect and report suspicious hardlinks to suid/sgid files.  False positives are prevented by doing reference counts for each inode having suid/sgid bits and multiple hardlinks.  The security check is done prior to each merge or unmerge phase and it will cause the phase to abort if a problem is found (so that the user can investigate before any files are removed). (trunk r6791:6794)

svn path=/main/branches/2.1.2/; revision=6795