Fixed late conversion to float which led to rounding errors when evaluating
per file write transfer speed.

CASTOR-5419: Ceph aborts when writing a 0-sized buffer

Prevented writes of zero size in DiskWriteTask. They happen
when we read from tape a file aligned with the memory block size.

notes about EOS workflows.

This is needed as getopt is not thread safe. This will allow usage of getopt to parse CTA command lines.

cta::SmartArrayPtr

cta::SmartFILEPtr

Replaced castor file header with CTA file header

Moved castor::server::
  BlockingQueue
  Semaphores
  AtomicCounter
  AtomicFlag
into cta::threading::

cta::server::ProcessCap

Removed unused files.
Added missed unittests.