complete restricted editor capability:
- rework permission testing
- send namesList only in non-restricted context, construct
  commandList only when appropriate
- rework crossword save handling and hide most error messages in debug
- confirmation functionality
- rework preview to catch all crossword selection, but avoid double
  loading

Bonus: save original and last user that edited a crossword to the
database. Not used yet.
give meaningfull error messages on database errors caused by asynchronous actions
3 fixes:
- let full editor bypass authentication on restricted build pages if
  they are already logged in
- false action name of wp_ajax_nopriv_save_crossword
- automatic crossword selection after project selection in PreviewEditor
  was flawed
security confirmation messages for irreversible administrative actions:
- as a prerequisite unentangle ImmediateController from
  CrosswordController
- move ImmediateController markup into its own file
- wrapper AdminController on Settings page loads immediateStore and crw
- abstract message interface actionConfirmation
on marking of false solution, mention word in dialogue
Versin 0.2.0: Second release for user testing