crud, take call, database change

LL-5:  Added active field in CadData table to indicate if a call is
available to be taken or not, as well as a pcr_id field to uniquely
identify the cad data and allow direct interaction with resource.
Revised the creation of the pcrid and its insertion into the CaddataSet
XML/Object.

LL-14:  Added a get active calls method, but the list returned appears
to be blank right now.