introduce repacking step in post-LS1 CSC simulation

Enable proper digi2raw -> raw2digi for CSC in post-LS1/Run2.
Quite a few of the customizations still remain, they are specific to new settings needed in ME1/1 and are now essentially the same as changes added in the Run2 data processing scenarios.

Differences come out as expected:
- monitoring and validation plots are now filled (were disabled earlier)
- minor changes in muon parameters/distributions (<1%) 
    - changes in muon distributions are minimal and can be traced back to changes in the CSC wire digis in ME1/1 chambers:
    - in simulation these are coming separately for ME11a and ME11b and occasionally the same wire could have separate hits in ME11a and ME11b (there is only one actual electronic readout channel), while after repacking wire digis of the same wire-group from A and B are merged into one digi. 
    - So, the number of hits is generally expected to reduce (~0.5% rate)
    - The downstream reconstruction can be affected in a minor way. The effect decreases going from hits to segments to standalone muons to global/tracker muons.