Added unit test to test it
Added a Repack Request expansion time limit (if the expansion last more than this time limit, it will be requeued)
Added jq to the buildtree

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

Also created the call in the maintenance process.

the method getNextRepackJobToExpand() will return a nullptr

This promotion is controlled so that only a limited number a requests
are in the
state ToExpand or Starting at any point in time. This ensures both the
availabality
of repack file requests to system while preventing an explosion of file
level requests.

Created a one-round popping from the container (algorithms) with status
switching.
  - Used for repack requests switching from pendig to to expand

Added ElementStatus to algorithms.

Implemented promotion interface in Scheduler and OstoreDb. The actual
decision is taken at
the Scheduler level. The function itself is called by the
RepackRequestManager.

Promotion is tested in a unit test.

Various code maintenance:
Switched to "using"-based constructor inheritance.
Fixed privacy of function in cta::range.

Sub request support to be added.

The maintenance process replaces the garbage collector process. It now
runs both garbage collection and disk reports.

This class will handle reporting like the GarbageCollector class
does for garbage collection.

Adapted the interface of scheduler and ArchiveRequests to allow delegating
reporting to the disk report runner.

This commit is not functionnal. We still need to:
- Implement the ToReport/Failed queues interface.
- Adapt the queueing in the scheduler/ArchiveMount
- Implement the popping of jobs to report.
- Implement the async reporter for the files.
- Develop the user interface for failed requests.

Added drive status reporting in scheduler
Added drive status reporting in OStoreDB
Added support for drive status listing in the front end
Removed virtual functions from the Scheduler, which is never overloaded.
Added DesiredDriveState structure to drive state.
Removed usage of duplicate MountType, DriveStatus and DriveState structures.
Created DriveInfo structure to allow recreation of drive register entry in all
reporting situation (potentially with partial/assumed info).

License comment is no longer filtered out by doxygen when generating web pages of the individual source files.