added warning if old DB is used; removed obsolete printout; update aliases for condDBv2
create parallel instances of files to use conditions DB v2, add corresponding option --useCondDBv2 to cmsDriver and update runTheMatrix to set this as default
as discussed in the ORP, make condDBv2 default in cmsDriver, remove setting it as default in runTheMatrix
 updated GTs for 7_2_0_pre1
updated GTs for 720 also for condDBv2 (incorporating #4329 from Roberto)
added missing statements for derived payload classes for boostio, replacing the
template specialisation for createPayload<> by the (new macro for) ones for deserialisation<>
Merge pull request #4295 from apfeiffer1/useCondDBv2

Use conditions DB v2 (72x)