Revert "Merge pull request #2833 from kasmi/Validation"

This reverts commit 75ec92505337f03230a89bf1a359bdddb26386b4, reversing
changes made to b49495e7bd07c0b33e47578213aaa37976c06eaf.
Revert "Merge pull request #2886 from Vlandr57/FastShower01"

This reverts commit b49495e7bd07c0b33e47578213aaa37976c06eaf, reversing
changes made to 87f2d95ea9e3d4722dba2f5677b40b4a40e2425e.
Revert "rel val SLHC"

This reverts commit 258d07f0d18952fbafc82fe12cf0dc32b44e0060.

Conflicts:
	Validation/CaloTowers/test/run_onRelVal_SLHC_AK_cfg.py