Tag to be used with the master branch of atlas/athena. Update(s) since 2.0.25: - Added FindHJets.cmake for finding the HJets generator; - Added prmon as a new external to AthenaExternals; - Fixed the generation of .d files for Ninja, to make dictionary generation behave correctly with this build tool; - Updated FindQt5.cmake to both fix a bug in it, and to make it create "simple" variables for the include directories and linked libraries to use.