Set PYTHONHOME (AtlasLCG-00-00-73)

	* ATLINFR-1076 Set PYTHONHOME
	* Tagging as AtlasLCG-00-00-73

2016-10-25 Johannes Elmsheuser <Johannes.Elmsheuser@cern.ch>
	* Patch FindDavix.cmake for correct library setup, used in
	  ByteStreamStoragePlugins
	* Tagging as AtlasLCG-00-00-72

2016-09-27 Attila Krasznahorkay <Attila.Krasznahorkay@cern.ch>
	* Made FindROOT.cmake check the version of ROOT found, in case
	  the user asks for a minimum/exact version.
	* Tagging as AtlasLCG-00-00-71

2016-09-07 Attila Krasznahorkay <Attila.Krasznahorkay@cern.ch>
	* Changed the logic in LCGConfig-version.cmake, so that it
	  wouldn't try to access AFS at all when we don't try to set
	  up an actual release.
	* Updated some find-modules to search for externals in
	  system directories when we didn't set up an actual LCG release.
	* The code now avoids setting up RPM dependencies for packages
...
(Long ChangeLog diff - truncated)