Issue #1144650 by Amitaibu: Fix notice if mini panel was deleted but still used in a panel somewhere.

conflicts.

Conflicts:
	contexts/terms.inc
	docs/sample_plugin_ct.inc
	help/plugin-style.html
	help/plugins-style.html
	plugins/layouts/threecol_33_34_33_stacked/threecol_33_34_33_stacked.inc
	plugins/layouts/twocol_bricks/panels-twocol-bricks.tpl.php
	plugins/styles/corners/rounded_corners.inc
	plugins/styles/default.inc
	plugins/styles/list.inc

Catching HEAD back up with all the changes on DRUPAL-6--3. Now ready to move forward with the 7.x port!

Just need to get the delete button working and then go through all the contexts, relationships and arguments to make sure their forms are working.

Initial port of panels mini; still need to work on the "context" ajax stuff and convert it to the new system, but the other stuff appears to work at least a little. Also include some fixes to layouts as "id" turns out to be illegal due to Drupal setting its own id string.

Initial D6 work -- this includes only panels.module stuff. Right now the drag & drop display editor works, layout, layout settings and render works. Special features such as cache and styles may or may not work.