Merge m-c to f-t
Bug 1083657 - Fix intermittent 'this.editor is null' in projecteditor;r=paul
Bug 1031404 - Browser Toolbox: Open on last used panel by default;r=jryans,r=Gijs
Bug 1101122 - Update about:home search styling. r=felipe
Bug 1101147 - Update about:newtab search styling. r=Mossop
Bug 1097942 - add UITour mechanism for selecting an engine, r=Unfocused
Bug 1101648 - UITour API to determine selected search engine. r=gavin
Bug 1101670 - UITour: ability to set a search term and show the search popup. r=dolske
Bug 1101669 - UITour: showInfo(search) should drop its notification from the end of the search box, not the middle. r=gijs
Bug 1101790 - setTreatmentTag API for UITour. r=felipe
Bug 1101790 - FHRProvider for UITour, records treatment tag data. r=bsmedberg
Bug 1101654: First use tour for search UI. r=felipe
Bug 1100770 - Better document existing printf_stderr, vprintf_stderr, fprintf_stderr functions.  r=froydnj
Bug 1100773 patch 1 - Fix bracing of indent loops in style rule print functions.  r=heycam
Bug 1100773 patch 2 - Convert style rule List methods to use fprintf_stderr.  r=heycam

Note that getting decent logcat output on Android and B2G requires not
splitting lines of output across multiple fprintf_stderr calls.
Bug 1100773 patch 3 - Add an aListDescendants boolean to nsStyleContext::List.  r=heycam
Bug 1102650 - Make the :-moz-dir() and :-moz-locale-dir() selectors be valid selectors (matching nothing) with arguments other than rtl and ltr, rather than invalid.  r=heycam
Bug 886188 - add debuggins logs to diagnose test15 timeouts in test_preload_actions.html. r=cpearce
Bug 1102523 - Update intree libpng to version 1.6.15. r=jmuizelaar
Bug 1102906 - Fix immovable caret after drag-and-drop. r=roc

The deleted lines were added in bug 924692 part 4. It will incorrectly
disable the caret in PresShell so that the caret cannot be moved by
using keyboard in nsSelectMoveScrollCommand::DoCommand().