class TXProofMgr: public TProofMgr, public TXHandler

 Create a PROOF manager for the standard (old) environment.

 Do real initialization: open the connection and set the relevant
 variables.
 Login and authentication are dealt with at this level, if required.
 Return 0 in case of success, 1 if the remote server is a 'proofd',
 -1 in case of error.

 Destructor: close the connection

 Invalidate this manager by closing the connection

 Dummy version provided for completeness. Just returns a pointer to
 existing session 'id' (as shown by TProof::QuerySessions) or 0 if 'id' is
 not valid. The boolena 'gui' should be kTRUE when invoked from the GUI.

 Detach session with 'id' from its proofserv. The 'id' is the number
 shown by QuerySessions. The correspondent TProof object is deleted.
 If id == 0 all the known sessions are detached.
 Option opt="S" or "s" forces session shutdown.

 Detach session 'p' from its proofserv. The instance 'p' is invalidated
 and should be deleted by the caller

 Checks if 'url' refers to the same 'user@host:port' entity as the URL
 in memory. TProofMgr::MatchUrl cannot be used here because of the
 'double' default port, implying an additional check on the port effectively
 open.

 Show available workers

 Get list of sessions accessible to this manager

 Handle asynchronous input on the socket

 Handle error on the input socket

 Send a cleanup request for the sessions associated with the current user.
 If 'hard' is true sessions are signalled for termination and moved to
 terminate at all stages (top master, sub-master, workers). Otherwise
 (default) only top-master sessions are asked to terminate, triggering
 a gentle session termination. In all cases all sessions should be gone
 after a few (2 or 3) session checking cycles.
 A user with superuser privileges can also asks cleaning for an different
 user, specified by 'usr', or for all users (usr = *)
 Return 0 on success, -1 in case of error.

 Get logs or log tails from last session associated with this manager
 instance.
 The arguments allow to specify a session different from the last one:
      isess   specifies a position relative to the last one, i.e. 1
              for the next to last session; the absolute value is taken
              so -1 and 1 are equivalent.
      stag    specifies the unique tag of the wanted session
 The special value stag = "NR" allows to just initialize the TProofLog
 object w/o retrieving the files; this may be useful when the number
 of workers is large and only a subset of logs is required.
 If 'stag' is specified 'isess' is ignored (unless stag = "NR").
 If 'pattern' is specified only the lines containing it are retrieved
 (remote grep functionality); to filter out a pattern 'pat' use
 pattern = "-v pat".
 Returns a TProofLog object (to be deleted by the caller) on success,
 0 if something wrong happened.

 Read, via the coordinator, 'len' bytes from offset 'ofs' of 'file'.
 Returns a TObjString with the content or 0, in case of failure

 Read, via the coordinator, lines containing 'pattern' in 'file'.
 Returns a TObjString with the content or 0, in case of failure

 Display what ROOT versions are available on the cluster

 Set the default ROOT version to be used

 Send a message to connected users. Only superusers can do this.
 The first argument specifies the message or the file from where to take
 the message.
 The second argument specifies the user to which to send the message: if
 empty or null the message is send to all the connected users.
 return 0 in case of success, -1 in case of error