The bottom line is the Mount and Job classes shall be passed around the
tapeserverd daemon for two purposes, to carry all the information about
the file copy to be transfered and to provide the notification interface
to the scheduler on which the tapeserverd daemon needs to call methods
to indicate the ends of transfers and mounts.

Improved the readbility of the Scheduler code by replacing dynamic casts with the addition of a simple getMountType() method to the TapeMount, ArchiveMount and RetrieveMount classes

Moved mock scheduler DB in a separate directory to reduce the number of files per directory.

Moved all of the classes in middletier/common to the scheduler directory because most of them are specific to the scheduler.  Please feel free to move those that are no so specific elsewhere.

middletier, itself separated in interface, SQLite, objectstore and
shared tests.
Moved all utilities (exceptions, threading...) to a shared utility
directory.
Created a single, shared unit test from all the scattered ones.

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