#844062: Turned the normal drag and drop editor into a renderer plugin, made the IPE part of it. Also some fairly serious code reorganization.

Clean up flexible. Attempt to reduce the use of unnecessary divs.
Add more ability to control flexible classes.
Add ability to fix flexible canvas to a set width.
Allow disabling of scaling for IE6 in flexible.

callback property from 'render panel' to 'render region', changed some
variable names inside the plugins. Not all working yet, though.

visibility' permission.

Introduce the Panels stylizer module which builds on the CTools stylizer base to create user definable, recolorable styles.