Deleted the checking of the presence of non superseded files during an Archive Mount.

Wrapped the content of MaintenanceHandler::runChild() into a new method MaintenanceHandler::exceptionThrowingRunChild()

This has been done in order to avoid the MaintenanceHandler to leak exceptions

This triggered the killing of the maintenance process by a sibling which had an unhandled exception and
hence called the destructor of the MaintenanceHandler. Usual use case sees an exit instead with no
full stack unwinding.

Moved disk-operations-related code into the new "disk" directory

Removed helgrind error by removing a linkage in the tapeserver/castor/tape/tapeserver/file/CMakeLists.txt file

Refactored the async deletion of repack subrequests files via XRootD (used the xroot's async deletion)
Deleted the folder containing the repack subrequests files (Local file + XRootD)

The folder containing the files need now to be removed

Added the creation of the directory corresponding to the vid of the tape to repack (xroot + local file system)

Replaced the map of tape files with a list as the assumption that we have one copy per copyNb is no more valid with repack.

Added a check while mounting a tape for writing : if some tape files located in the writing tape are not superseded by others,
the write session will fail.

Note: The test CatalogueTest.exist_non_superseded_files_after_fseq is supposed to fail.

The retrieve requests now carry all the information necessary to create the archive jobs.
Retrive requests carry an isRepack boolean. The distinction between repack and non-repack behaviour
is pushed as low as possible in the api (in the object store) so that client code can be more
generic. For the same reason, the
The expand repack mode (re-creation of missing tape files) is not supported yet.
Changed the represenation of copy numbers to uint32 (as this is the smalled number supported but protocol buffers).
Added ArchiveRoute::StorageClassMap and ArchiveRoute::FullMap to store archive routing in memory.
Added repack buffer base URL support, and mechanism to compute temporary copy location in disk cache.
Fixed bug in ObjectOps<>::asyncInsert();
Inplemented the path generation for repack disk storage (<BaseURL>/<VID>/<FSeq (09%d)>).

Harmonized the copyNb type to uint32_t
Corrected a bug in RetrieveQueue::getContainerSummary() --> After insertion in the queue, the number of files and bytes added were equal to 0.

Changed 'catch (cta::exception::Exception ex)' to 'catch (cta::exception::Exception &ex)' in order to avoid error: catching polymorphic type ‘class cta::exception::Exception’

Changed 'catch (cta::exception::Exception ex)' to 'catch (cta::exception::Exception &ex)' in order to avoid error: catching polymorphic type ‘class cta::exception::Exception’ by value

Changed 'catch (exception::Exception ex)' to 'catch (exception::Exception &ex)' in order to avoid error: catching polymorphic type ‘class cta::exception::Exception’ by value

Status of repack retrieve request changed to RJS_Succeeded, started to insert the repack retrieve request into RetrieveQueueToReportToRepackForSuccess

Repack RetrieveRequest reported as success after mount and retrieve successful (expandRepackRequest)

(see 'ps -ax -o "pid comm cmd"  | grep /usr/bin/cta-taped').