now documented in detail.

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

#749504 by hefox: Add a bit of documentation explaining that block.tpl.php ignores Panels specific block fields.

Improve the renderer selection framework. This framework has no UI, but it utilizes exportables and new choices can be hand crafted.

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