Fixed selection of sources of d2d (only production nodes were considered, while readonly and draining are also ok)

This includes :
  - merge of d2dtransfer into diskmanagerd
  - drop of the WAITDISKTODISKCOPY state in DiskCopy, and of the diskcopies for ongoing replication in general. Now DiskCopies are only created at the end of the replication, when they actually exist on disk
  - drop of the StageReplicaRequest table and concept
  - introduction of the DiskToDiskCopyJob table, holding the list of ongoing disk to disk copies
  - a split of transferToSchedule into userTransferToSchedule and D2dTransferToSchedule
  - an according split in the dispatcher part of the transfer manager to call both methods. Note that with this commit, both methods fill the same FIFO queue of transfers and both take everything they can find without any throttling.

At this stage, the draining facility is broken.

Implemented the database view and job, and modified nschown to also update cns_seg_metadata.gid.
Querying and displaying will be done with e.g. the cockpit.

Added prompt for vmgrSchema

Implemented by caching the count at the beginning and showing it instead of the COUNTs
of SubRequest. The latter is available as a -d, --detailed report with all progresses (# of recalls, # of migrations, etc.).

Bug #95189: Time discrepencies between disk servers and name servers can lead to silent data loss on input.

Made the CastorFile.nsOpenTime column NOT NULL and added code to prefill it
at upgrade time. This will be a long operation...

	Add class XrdxCastorClient which handles the async requests and responses

        Move the -D_FILE_OFFSET_BITS=64 flag from the global to local context
        Fix a few errors like unused parameters

Added first draft of ithe stager and the name-server upgrade scripts so they
won't be forgotten.

Fixed in the trunk.

Bug #101372: Incorrect cleaning of old requests leading to wrong final reported statuses of repack -s

Fixed archiving step after a repack abort.

Added the synonym named Vmgr_tape_status_view.

Removed the not yet released or used PL/SQL functions VMGR_GET_TAPE_STATUS and
VMGR_TAPE_IS_RECALLABLE.  They have effectively been replaced by the addition
of the VMGR_TAPE_STATUS_VIEW database view.

Added the VMGR_TAPE_IS_RECALLABLE() function to the VMGR database schema
together with its helper function VMGR_GET_TAPE_STATUS().

Done. Added also the system wide totals as several recall groups might refer to the same tapes. With 3 recall groups we could have 5 + 5 +5 tape being recalled being in fact 3 times the same 5 tapes.

and fall back to the OS uid if not

The sqlplus program interpretts the character as a variable and therefore asks
the user for a value for the variable.

Fixed in the trunk.

Bug #95189: Time discrepencies between disk servers and name servers can lead to silent data loss on input

Fixed a bug created by the commit of revision 25079.  NOT NULL of the stagertime column definition should have been written after the DEFAULT clause.