* Remove from __future__ import print_function, because we
no longer support Python2.
* Clean out unused parts of tools/scripts/scriptCommon.py
* Move appveyorMergeCoverageScript to Python3
* Update user reporting in *release scripts
* Cleanup module imports
On systems where the file system has excute permissions, this script was
not marked as executable in a clean git checkout and so could be run
without first changing the permissions. Fixed by setting the relevant
git flag.
