Split the memory managers into headers and implementation.
Cut the number of includes by forward declaring classes.

Added Doxygen comments in DiskWriteTask.hpp.
Reformatted the code in DiskWriteTask.cpp, DiskWriteTask.cpp and added logging.
Removed unnecessary members m_maxFilesReq and m_maxBytesReq from DiskWriteThreadPool and adapted callers.

Added a bunch of comments for MigrationTaskInjector,MigrationReportPacker, RecallTaskInjector and DataFifo

Thus, The real reporters do not inherit publicly from it => Changed all the lines of coded that had to be changed

Fixed unnecessary virtual declarations in classes without inheritance (only detected by the SLC5 compiler).

Removed interface classes DiskReadTaskInterface, DiskWriteTaskInterface, DiskThreadPoolInterface

Moved MemException from castor::tape::tapeserver::daemon to castor::tape::exceptions and changed the uses in the code
The tapeserver/daemon/Exception.hpp was empty after that, he has been removed

Added missing call to finish for the memory manager in MigrationTaskInjector.
Added missing setting of task injector to the disk read thread pool in MountSession::executeWrite.
Fixed missing setting of m_vid member variable in TapeWriteSingleThread.
Fixed settig of wrong parameteres in castorConf variable in MountSessionGooddayMigration unit test.
Added validation of the migrated files checksums in MountSessionGooddayMigration.

Otherwise, there was a race condition between the control thread and the worker threads.
Now, the log context of the worker thread is passed and used by popAndRequestMore.

in ClientProxy.

This unit test still needs additional checks for completion (currently commented out).

the bytes/files numbers are specified at construction time and thus no longer necessary at the call

The session mode (and client type) is now construction parameter.
We now support migration requests as well.
A new facility records the checkums received in migration notifications.

Got rid of BlockingQueue::tryPop and changed the memory managers destructor to use instead popGetSize

Added a few logs in DiskReadThreadPool ans fixed some log levels into MemManager MigrationTaskInjector and
RecallMemoryManager

Conflicts:
	castor/tape/tapeserver/daemon/MountSession.cpp
	castor/tape/tapeserver/daemon/TapeWriteSingleThread.hpp

In case of global error during migration, all requests (old or new one) for jobs are discarded

when failing to signal the end of an empty session.