#668640 by casey, aspilicious, et al: Re-implement Overlay without jQuery UI Dialog; massive performance improvement, helps address several critical issues.
#794184 by JacobSingh, catch, chx: Fixed contact_update_7002() fails when the contact module is not enabled.
#797024 follow-up by justinrandell: Remove critical performance regression due to stale file time values.
#797024 by pwolanin, justinrandell: Fixed Moving a class between files can cause SQL errors on registry rebuild.
- Patch #803212 by effulgentsia, Heine: protection against forgery of input selection value doesn't work with checkboxes.
- Patch #807396 by Berdir, carlos8f, David_Rothstein: database errors not displaying during install.
- Patch #312144 by CorniI, dropcube, EvanDonovan, Damien Tournoud, David_Rothstein, tstoeckler: install fails when default.settings.php is not present.
- Patch #545610 by brandonojc, Everett Zufelt, mgifford: search form needs a header for accessibility.
- Patch #701358 by aaron, quicksketch, chx, pwolanin, aspilicious: the file API presumes a hiearchical file storage.
- Patch #276876 by mr.baileys: remove case sensitivity from variable names (get/set/del) through extra documentation.
- Patch #766100 by andypost: undefined function _system_rebuild_theme_data() when trying to run update.php.
