Fixed case where a gridFTP client sends overlapping chunks. We now raise an error instead of screwing the checksum

Restaured ZMQPollEventHandler's virtual destructor and commented out the cleaning of the reactor in the fork process (which is dead code once the forker will be used for these sessions)

        Fix indentation and whitespace cleaning

This will give a more realtime feedback of the recall operations.

Added support for the manual mode in the session cleaner and added more verbose reports of unload/unmount.

        Refactor some variable names to follow the naming conventions.
        Properly use the Eroute object before the logging is configured.
        Fix the fsctl function which now (XrootD 4.0) uses as command a combination of flags, therefore
	comparing with SFS_FSCTL_LOCATE is not enough, we need to do a bitwise "and" (&).

Fix typo when constructing the opaque information for the signature of rtcpd transfer over xroot protocol