fix cke config links again

needs to support any instance
fix for plugins not loaded for ajax.php

This prevents the editorlinks hook from working I think.
filters broken if no filters
redo ajax saving on edit.php

better ajax compat with old plugins , changed autosave to 1 over true
abstracted ajax check into function for legacy plugins that break
changedata.php backport compatability

better button disabled state

rewrote all js for ajax and autosaving