Adds the command line option "--concurrent-events=N" which enables individual
control of the number of concurrent events as well as the number of threads in
an AthenaMT job.

If --concurrent-events OR --threads is used, the job is assumed to be MT.

If neither is set, then the job is not setup as AthenaMT.

If only one of --concurrent-events or --threads is used, the other takes the same
value (ie, same number of concurrent events as threads).

Both --concurrent-events and --threads can also be set simultaneously


Former-commit-id: f829830e

Removing uses of PyCintex, CINT, Reflex and ROOT5 from packages in
Control - they are not needed in ROOT6 world.


Former-commit-id: 61252ce5

	* Tagging AthenaCommon-03-03-03
	* Adding an overlay task to the DetFlags

2015-06-04  Charles Leggett
	* tag AthenaCommon-03-03-02
	* add common concurrency opts (nProc, nThread) to ConcurrencyFlags
	  jobProps
	* added CONFIGURATION_ERROR to ExitCodes (0x09)

A       python/ConcurrencyFlags.py
M       python/ExitCodes.py
M       python/AtlasThreadedJob.py
M       python/AthOptionsParser.py
M       share/Execution.py
M       share/Preparation.py

2015-06-01  Charles Leggett
	* tag AthenaCommon-03-03-01
	* on behalf of John Chapman
...
(Long ChangeLog diff - truncated)

	* share\Preparation.py: movel ROOT6 setup to PyTools/Helpers.py
        * tag AthenaCommon-03-02-01

2014-10-28  Marcin Nowak  <Marcin.Nowak@cern.ch>
	* python: merged with AthenaCommon-03-00-00-02 to get Gaudi v25.3 configurables
        * tag AthenaCommon-03-02-00

2014-10-24  Marcin Nowak  <Marcin.Nowak@cern.ch>
	* share\Preparation.py (install_pycintex_filter): added import
	hook to signal PyCool that PyCintex can't be loaded
        * tag AthenaCommon-03-01-04

2014-10-23  Marcin Nowak  <Marcin.Nowak@cern.ch>
	* share\Preparation.py (addROOTIncludePaths): add Eigen and Geant4
	paths
        * tag AthenaCommon-03-01-03

2014-10-22  Marcin Nowak  <Marcin.Nowak@cern.ch>
	* share\Preparation.py: for ROOT6 cppyy pretends to be PyCintex.
	* share\Preparation.py: use addROOTIncludePaths()
...
(Long ChangeLog diff - truncated)