Allow themes to provide default pages so that Panels Everywhere enabled themes can provide layout variants for the site template.

#686764: Update page tokens to use actual page rendering mechanism rather than the tokens which causes them to appear as having content even when empty.

#604976: Prevent Page Manager from throwing errors when no modules that provide variants are available.

#573646: Attempt to make sure page manager does not try to respond to menu/theme hooks when CTools is not enabled.

#639548: export.inc cache was not properly respected when loading individual items, leading to multiple redundant queries.

#665338 by andypost: Fix instances of ctools_context_handler_render that used wrong format for sending arguments.

#654218 by Roi Danton: Improve documentation of dependent.inc to talk about annoyances with checkboxes, radios and fieldsets.

#661332 by yhahn: Allow export.inc to export stdClass objects by exporting them as an array and casting them to an object.

#651852 by coreyp_1: Add caching to content subtypes to save some queries. This means developers will need to clear caches when changing content type code.

#625696 by dmmckenna: Bulk exporter did not define empty array at beginning in code it creates for you.

Added support for context keyword substitutions on override paths in content panes provided by views_content.

#687534: ctools_context_handler_edit_criteria() now does the necessary includes such that access plugins can easily add their own js files to selection criteria forms.

#682900: Fixed array_splice() call to use proper operand types, which was causing fatal errors on PHP 5.3.

Introduce 'export callback' to individual fields in export.inc. Add some documentation to export.html -- much of it borrowed from stella!