ConfigDP new GT connection string functionality and PCL fixes

This PR addresses the following issues:
* add optional parameter "globalTagConnect" to allow dinamic configuration of GT connection string @ Tier0 (this is needed to run 72X with CondDBv1 @ Tier0)
* fixes a problem in handling multiple ALCAPROMPT datasets 
* introduces mapping of PCL workflows on the basis of the ALCAPROMPT dataset passed through the parameter "alcapromptdataset"