[v6r12] New tools to enter resources info to CS

The new Bdii2CSAgent is doing the similar work as CE2CSAgent got the CEs, but also processes SE information and is based on utilities that are also used in the corresponding command line tool dirac-admin-add-resources. The dirac-admin-add-resources command interactivly walks through all the resources available in the BDII for a given VO and guides the user on their adding to the CS.
These are additions, CE2CSAgent will continue to work, although it becomes obsoleted and eventually will be dropped. It is recommended to switch to using Bdii2CSAgent instead.