#869766: Fix occasional problem with flexible layout pushing the entire layout to the left in certain fixed-width only configurations.

#869766 by rupl: flexible layout builder could fail with multiple columns in only one row. (Needs clear cache to see changes in generated CSS.)

In Flexible, the "class" would not stick when adding a new region/row/column but would when editing.

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

Change "panels_layouts" table name to "panels_layout" as it should be (no update_x hook for this). Fix a couple of flexible bugs introduced in new changes.

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.

#745808 by Robbert: use number_format() in flexible width calculations to ensure locale settings cannot bork generated CSS.

#683162: Convert all plugins to use new $plugin = array() format. This is less brittle than the specially named hook.

Add a new field to allow setting a panel title from one of its panes.

#460200: Allow regions and columns that have only 'fixed' width items. Disallow changing a 'fixed' item to 'fluid.'

Store a panel task handler's display in the database rather than as part of the handler, allowing flexible to cache the CSS using the display ID.