PROOF progress dialog window

Yesterday Gerri has implemented a useful patch in PROOF. From the now on it is possible to switch the PROOF progress dialog off.

Add method TProof::SetProgressDialog(Bool_t on = kTRUE) to disable the progress dialog
window while preserving graphics from the final actions in Terminate. This may be useful
when X over network is slow. To disable the dialog the call

proof->SetProgressDialog(0)

has to be placed before Process(...).

Many users, who does PROOF remotely will find this as an extremely handy feature. ;)

The patch was committed as a revision 33562.