sface-0.1-20

Setting tag sface-0.1-20
Added batch slice renew feature
Updated XMLRPC tracker to keep history of XMLRPC calls, support scrolling, and parse fault messages
Retrieve available resources and resources bound to slices from independent ListResources calls
Added ability to delete slices
Added SliverStatus screen
Support for creating slivers directly on ProtoGENI, bypassing slice manager
Support for new RSPEC methods in latest SFA code