EGM .cc and python patch for new regression tags in the DB

The PR contains .cc updates and ESPrefers for the new regressions. 
The global tags are in preparation.

In general we see moderate to substantial improvements in the photon/electron energy response in all eta regions.

You can see the overview of the training here:
https://indico.cern.ch/getFile.py/access?contribId=3&resId=0&materialId=slides&confId=293993

The result of private reRECO (black) on top of vanilla pre12 (blue) attached for electrons (Zee 50ns PU, 13 TeV):
--- ecal energy only
![erecoetrue_hzz50ns_ged_forpre13_lin](https://f.cloud.github.com/assets/1068089/2019522/99d91928-8824-11e3-997e-bab0f8f0018a.png)
![erecoetrue_hzz50ns_ged_forpre13_log](https://f.cloud.github.com/assets/1068089/2019523/99dae6fe-8824-11e3-9980-26f277b310bd.png)

--- combined p4 measurement 
![e4petrue_hzz50ns_ged_forpre13_lin](https://f.cloud.github.com/assets/1068089/2019536/c174c284-8824-11e3-8694-5c8c4329bf43.png)
![e4petrue_hzz50ns_ged_forpre13_log](https://f.cloud.github.com/assets/1068089/2019537/c174fe66-8824-11e3-8bf4-7580475ebb3a.png)

and for photons (Hgg in 50ns PU, 13 TeV):
![erecoetrue_hgg50ns_ged_forpre13_lin](https://f.cloud.github.com/assets/1068089/2019548/e77f0796-8824-11e3-9212-1f5bac4fd8ff.png)
![erecoetrue_hgg50ns_ged_forpre13_log](https://f.cloud.github.com/assets/1068089/2019549/e7858206-8824-11e3-9cd8-f8d65bdf9665.png)