collection 6.x-1.2

Implemented proper access control for collection block.
Block configuration allows for setting whether to render the nodes as full nodes or teasers, and whether to add node links.
"Nodes in same collection" is henceforth referred to as "collection siblings".
Added CTools/Panels content_types support, so
Implemented hook_ctools_block_info so the regular blocks doesn't show up in panels.