Allowed not to save prescales in SlimTriggerResults

The main configuration is adjusted to save prescales in case of real data only.
Removed unused variables

Removed b-tags calculated with JP algorithm and numbers of jet constituents (total, muon, and electron). It sums up to 16 bytes per jet. Also removed commented out placeholders for event-shape variables.
Converted branches with integers to chars when possible

In RelVal ttbar it saves about 50 bytes per event (~6%).