Avoid SEGV after an error occurs during a stat() call.
Update notes on stat() fix.
Correct node matching when adding new node.
Provide full support for public/private IP networks.
Update notes on public/private network support.
Avoid unitialized warning.
Fix another unitialized possibility warning.
Provide disconnect notifiation to underlying file system.
Update notes on new SFS Disc() method.
Merge branch 'master' of https://github.com/xrootd/xrootd into filecache

Pull from origin/master.