Enable new pixel cluster position features

Three new features for pixel cluster position estimation (CPE) were included in 7_1_0, but not yet activated since they rely on global tag information, available since MC_72_V2 and GR_R_72_V3.
Here these features are activated.
1. Enable GenErrors database object for generic CPE, which are faster than the full template database objects previously used.
2. Enable to take the lorentz angle width from database (instead of configuration)
3. Enable lorentz angle estimate from alignment from database. Currently database entries are 0 such that this has no effect until alignment input.
It was checked that none of these features changes pixel cluster position resolution within 1% of the resolution.
Automatically ported from CMSSW_7_2_X #5238