in ClientProxy.

Moved all files related to Client to client/, changed the namespace and fixed the files consequently (header,usings,...)

Added explaination for more bare dynamic casts to reference. Also added
cast to void for the result (to prevent compilation errors).

Added explaination for a bare dynamic cast to reference, which is not to
straightforward.

Fixed missing unsigned type on literal for SLC5.
Removed leftoved from merge
Removed unused class with Clang errors

Adapted the rest of the code consequently

The client interface now manages all requests and reports for the mountSession and
sub classes. Most request reply sequences are unit tested.

The new ClientSimSingleReply template allows the planning of a single reply of any type.
The request-reply combinations for all the currently implemented calls in ClientInterface
have been validated using it.

The interface has been adapted to pass the information back to the user.

Detailed interface and contents still need to be fleshed out.

Added support for TPconfig, looking for drive and density.
Improved logging and error situations handling.

The MountSession will be the basis of the forked tape sessions.
ClientInterface is now a utility for it.
Added timing support to ClientInterface functions.
MountSession logs through the scoped log interface.

This class will handle all communication with the tape gateway of the command line clients.
It replaces the development code in the tapeSession class (removed).