Items addressed
* Get rid of custom attribute srcNode
* Change extraClasses to a config only parameter.
* Change attribute fullscreen to a method.
* Restore the original window overflow value.
* Use setStyles instead of setStyle for performance.
* Tinymce end the zindex wars
* Prevent fullscreen dialogs in an iframe (tinymce managefiles plugin).
* tinymce: Cross browser fix for zindex on popups
* Use CSS for overflow changes (easier to keep track of the previous state).
* Fix Coding style for css changes
The current managefiles plugin assumes that every file manager will be created
by either calling use_editor without filepicker options ($fpoptions) or with
filepicker options that include options for the moodleimage plugin.
Marina Glancy