[Atlas] Remove cout
[Atlas] Add feature sorting and filtering
[Atlas] Add UI management for feature sorting and filtering
[Atlas] Add better exception handling
[Atlas] Add unit tests for sorting and filtering
[Atlas] Add SIP bindings for feature sorting and filtering
[Atlas] Add Python unit tests for feature sorting and filtering
[Atlas] Restore painting on error return
[Atlas] Add i18n to error messages
[Atlas] Fix minor UI behaviour
[Atlas] Replace the sort direction combobox by a up/down button
Snap to paper items and consider multipage compositions when showing snap lines
Merge pull request #422 from Oslandia/atlas

Feature sorting and filtering for atlas generation
Documentation update for QgsRubberband
Merge pull request #427 from matthias-kuhn/rubberband-doc

Documentation update for QgsRubberband
Add collapse toggling synchronization to QgsCollapsibleGroupBoxBasic

- Holding Alt modifier key when toggling collapsed state will synchronize the toggling across other boxes with the same syncGroup QString value
- Synchronizes boxes of same syncGroup via recursive search in parent or grandparent widget (if grandparent is not QgisApp)
Make measure tool dialogs stay on top of other windows during operation

- Not tested with X11, may need Qt::X11BypassWindowManagerHint too
fix windows build
Add collapse toggling synchronization on Alt-click of title to QgsCollapsibleGroupBoxBasic
ocispatial: require OCI library