readability.
- Added context_ui_context API functions from _admin.inc
- Added theme_context_ui_node_links() which provides contextual node add links
based on the active context and user permissions.
- Fixed a bug where local tasks were rendered improperly / caused strange
behavior because of improper grafting of items into the menu tree.

Because of issues when using multiple themes we're going to assume that phptemplate_blocks is *the* function name we want to use.

database
- Improved admin UI layout for clearer distinction between context
setters and context getters

Fixed a bug where local tasks weren't rendered if a page call back that wasn't the default local task set a menu context

No longer load context_ui_admin.inc on every page load. Standardized format for space, key, value strings (numbers, lowercase letters and underscore only). More concise test.

Adding context_prefix, a module that allows other modules to register url prefixes for setting a context