#336469: Fixing sticky checkbox for hidden blocks and using more human-friendly labels in block UI. From dmitrig01.

#356960: Fix for context_ui_set() error where an array of IDs are passed. context_ui_set() no longer accepts arrays for the $id
parameter. Reported by loze.

#356626: Adding patch to improve performance and integration with memcache & aggressive caching. From m3avrck.

- #354882: Strict check between node objects when settings node context. From anantagati.

Adding checks and cleanups to ensure that context definitions don't have any empty items attached to them

configuration pages.
- Fix for block configuration page displays which needed an update to the newest context API
functions.
- Splitting the main context_ui form_alter() into form_$form_id_alters where possible.

settings made through the block module.
- Cleaning up old code.
- Replacing phptemplate_blocks() hack with a less hacking
hook_theme_registry_alter() to hijack theme_blocks().

- Update to README.txt to reflect updated menu links functionality and
  include basic list of hooks provided by context_ui.
- Update to DB schema to reflect new storage system. Update script
  included.
- Improved namespace consistency -- all hooks now use context_ui
  rather that context as their function prefix.
- Moved deprecated functions / backwards-compatibility functions to
  the end of context_ui.module.
- Major refactoring of context storage schema. Contexts are now cached
  for performance and default contexts are no longer stored in the
  database.