Recent development from Valeri

* Rename PFCal to HGCal and split it to HE and EE modular definition. There are two xml files now, one for EE and one for HE.
* DDAngular positioning is implied.
* Names of EE and HE as well as path from Top CMS volume
to HGCalEE and HGCalHE is specified.
* Materials for GEM parts are coming from the global list.
* There is parameters section, as a reference on what was assumed for geometry description. The most important is the specification of the first/last volume number for given Solid (to be used in a sensitive volume declaration), see vectors.