Implement context keywords which also use the converters. Add converters to user, fix taxonomy converters.

Do not force panes to fail just because subtype does not exist. They may want to render something anyhow.

More robust AJAX stuff that will eliminate some ugly errors plus prevent double clicks on ajax links.

Port block content from Panels, reorganizing them so that the categories are more what the content is about than where it is from.

Integrate the default form (title override + context selection) with the first step in the pane config forms.

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