Initial commit of content API into ctools. Only one content type is ported, but there are some docs.

Checkpoint checkin. Lots more interesting functionality -- pages can now be set to "single" or "multiple" task handlers, and having "single" removes the task handler arrange UI. Please some serious code re-organization so that Panels can have just one context-based task handler for multiple tasks.

Checkpoint checkin. Partial implementation of page task with generic subtasks, plus revamp of arguments, new access plugins (stolen from Views), updates to the wizard to make it fully compatible with the modal and some minor improvements to make it more flexible.

Add a little AJAX support to the wizard tool. I think it still needs more but I will not be sure what until I actually need to use it.

A tool to facilitate multi-step wizards. I do not think this is quite finished yet but it handles the simple case pretty well.