Simplified the tape file serializatrion by using directly the checksums serialization.

Added support for listing files with checksum not set (and changed the format to adler32:0xABCDEF12).

Added suppression lists for external libraries and old castor one-off allocations.
Enabled the memory check make test.

Added protection agains creation of checksums of the wrong size and added casts where needed.

Added rados library version validation and cleanup.
Created a new shared library to ensure instantiation of singleton object supporting the former.
Removed several double creations of drive objects in unit tests.
Added cleanup for potentially unused drive objects in unit tests.

Added url style conversion of checksums
Added support for checksums in mockNs
Fixed support for checksums in the scheduler
Re-instated several ASSERT_NO_THROW which were commented out during debugging.

(some libraries from the castor package are currently necessary).

Extracted BackendPopulator and OStoreDBWithAgent from the XrootD plugin to avoid linking the plugin too widely.

Added a cta-lib package, simplified the libraries and turned on the automatic unit testing during rpm build.

Added explicit dependencies for header files and replaced misplaced include to ensure parallel comilation.

Added tolerance to BackendRados::ScopedLock::release() when releasing a deleted object's lock.
Switched back to old style m_radosCtx.objects_begin() for compatibility with older releases of ceph.

Added a list method for the backends so we can clean up the rados store before running each unit test, which expects a fresh store.
Added a new command line tool to list the contents of the backends.

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