Adding an overlay task to the DetFlags (AthenaCommon-03-03-03)

	* 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)