allow to add a QToolBar to QGisInterface (will allow subclassing)
sip: add transfer
[composer] Update number of pages in gui whenever number of pages is changed by multi frame items (sponsored by City of Uster, Switzerland)
[composer] Allow choosing *.htm and *.* files for html item source (sponsored by City of Uster, Switzerland)
[composer] Manually removing a frame from a multi frame forces the multi frame to UseExistingFrames mode, otherwise the frame may not actually be removed. This changes makes the behaviour of multi frames a bit more predictable (sponsored by City of Uster, Switzerland)
[composer] Add frameOutlineWidth property for composer items (sponsored by City of Uster, Switzerland)
[composer] Copy frame properties (outline, background, render settings) when creating new frames in a multi frame (sponsored by City of Uster, Switzerland)
[composer] Fix duplicate frames when multi frame is set to Repeat on Every Page (sponsored by City of Uster, Switzerland)
[composer] Add method for overriding page break location in multi frame items (sponsored by City of Uster, Switzerland)
[FEATURE][composer] HTML frames no longer cut through lines of text when splitting over multiple pages (sponsored by City of Uster, Switzerland)
[composer] Don't draw repeated html contents if mode is UseExistingFrames and frame should be empty (sponsored by City of Uster, Switzerland)
[composer] Add checkbox for controlling whether html items should use smart page breaking (sponsored by City of Uster, Switzerland)
Fixes #9656 - allows to scroll per pixel vertically in the log messages tabs
Merge pull request #1317 from 3nids/addtoolbar

allow to add a QToolBar to QGisInterface
Fix #10127 (crash on parallel rendering of spatialite layers)

There was a run condition in connection pool singleton: at the beginning,
the singleton got initialized twice. Now the singleton is handled
as a static function variable which should be initialized in thread-safe way.
Start work on new composer table column definition
fix some failing tests
More fixes to api
more fixes