Sub request support to be added.

Added partial support for repack queueing in scheduler database,
scheduler and CLI.

We now have live (to be executed), failed and to be reported queues.
Archive jobs have all three types, retrieve jobs do not have a to be reported
queue. The RootEntry interface interface now provides the choice between the types.
All uses are currently hardcoded to LiveJobs.

This will remove contention on the drive register as drives uipdate their statuses.
Also simplified structures in OStoreDB implementation (less references with added friend relations).

Some further adaptation was needed on the templates.

Added a tape queue and status cache update function in objectstore::Helpers.

In order to be efficient, the data (tape status and queue sizes) is cached in memory.
This function needed access to the catalogue (where the tape status is located).
This in turn required passing the catalogue object to:
 - The garbage colletion functions for all object types.
 - The garbage collector object now keeps a reference to the catalogue.
 - The path to the catalogue credential file should now be passed to cta-objectstore-collect-orphaned-object
 - The OStoreDB also needs a reference to the catalogue in order to queue retrive requests.

 The garbage collection member function are now also being passed a log context, so the requirement for better
 log of object fate can also be fulfilled later. This in turn required the passing of a logger object to
 the object store and relative helper classes.

 Finally, a dummy catalogue class has been created to be used in unit tests.

Factored a first function out of OStoreDB into Herlpers.

Added binned running counters (ValueCoundMap) for managing summaries of priorities in object store queues.
Simplified the interfaces to the getPendingArchiveJobs and getPendingRetrieveJobs functions in Scheduler and SchedulerDB.
Removed now unused ArchiveToTapeCopyRequest.
Removed long unused mockScheduler.
Removed _old_protoype files.

New URLs are rados://user@pool and file:///tmp/XXXXX. Otherwise, we fall back to interpreting
the URL as a bare path.

Implemented unit tests for storage classes and archive routes.

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