GAUDI-978: merge hive branch into master

fixes GAUDI-978

Added 522 commits:

• 85ab1e02...aa624e17 - 503 commits from branch master
• 529030ba - made the test GaudiExamples.CloneWithPrivateTools a "qmt" test
• e27f814a - Merge branch 'master' into hive
• 7d202bb0 - Added a few missing "override".
• fd7f1add - Merge branch 'master' into hive
• db99c50b - added timouts to the GaudiHive tests
• f9148555 - renamed (back) Makefile to Makefile-cmake.mk to simplify merge with master
• fd6bdd86 - ugly fix for ToolHandleArray for ATLAS
• 0d597c5c - Merge branch 'dev/hive/ToolHandleArray' into 'hive'
• 746c77d9 - backward compatibility of ToolHandles
• 335f8ef9 - add -DATLAS to compiler flags for ATLAS
• 7881aad6 - Merge branch 'master' into hive
• a9d9e8c9 - demoted "Loop Finished" message to debug
• 72cc5c02 - renamed Input and Output properties to Data*
• 290f4555 - updated reference files after rename of Inputs and Outputs
• e099b6f8 - fixed problem with Python DataObjectDescriptorCollection
• 0b5bc472 - fixes and clean up to DataObjectDescriptor Python classes
• 62118d94 - more clean up in GaudiKernel.DataObjectDescriptor
• db6359ce - updated reference files after fixes to DataObjectDescriptor
• c7c787c7 - Merge remote branch 'master' into hive

Added 2 commits:

• f4ee9116 - fixed some compilation warnings
• 510fdd4d - minor fixes to build configuration

Title changed from [WIP] GAUDI-978: merge hive branch into master to GAUDI-978: merge hive branch into master

Status changed to merged

mentioned in commit 57f356c5

Mentioned in commit 4ee0b957