panels 7.x-3.7

This is a bugfix release based on regressions brought up in the security release for Panels 3.6. This release goes to 11!

This release is strongly recommended over Panels 3.6 to fix the following security issue:

* Panels - Critical - Multiple Vulnerabilities - SA-CONTRIB-2016-047

Fixes since Panels 7.x-3.6:

• #2787241 by dsnopek, cboyden, japerry: IPE buttons do not reappear after changing layout
• #2787047 by dsnopek: Pages created via the "Landing page" wizard don't have storage type/id set
• #2787103 by dsnopek, cboyden, japerry: IPE with Page Manager permission no longer works
• #2785843 by bkosborne, dsnopek, svenb: CSS IDs and classes for panes are potentially rewritten
• #2787113 by generalconsensus: Mini panels saved in code get deleted
• #2786677 by zuernBernhard, dsnopek: Error: Call to undefined method panels_renderer_standard::get_panels_storage_op() in panels_renderer_editor->get_panels_storage_op_for_ajax() (Zeile 548
• #2787123, #2188277, #2786073 by malcomio, japerry, dsnopek, ericjenkins: Update 7302 needs database updates before executing.
• Various documentation fixes from 3.6 release.
• #2462331 by EclipseGc, dsnopek, mglaman, cboyden: IPE insufficient for Panelizer (data loss when using revisions)
• #2785915 by dsnopek, sylus: Panels permissions update causes access denied on page manager pages
• #2786285 by bkosborne: Access denied 403 when trying to add panel nodes