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

#375686: Create panels_get_current_page_display() to replace the old panels_get_current_page() function.

Added allowed layouts to settings form for panel pages, nodes, minis.

Fix panel page type to actually respect the contexts.

#424176: Panel nodes: Remove unused layout screen, fix some notice errors, give context a description.

Break panels_node_content into a module + a .inc file to more clearly represent how content types can work in a module. Also fix several notices by providing defaults for the form.

Add a new directive to content types to allow fetching information about a single subtype (i.e, view, block) rather than all at once.