[processing] Changed raster calculator to ask main layer separately
[processing] added 'crop to data' algorithm from SAGA
[composer] Refactor QgsComposerItem:
- New class QgsComposerObject, which both QgsComposerItem and QgsComposerMultiFrame
derive from. This class contains the framework for data defined composition properties.
- New class QgsComposerUtils, containing helpful static functions previously in QgsComposerItem
- Test suites for data defined settings in QgsComposerObject and functions in QgsComposerUtils
Follow up 2041fc24
multi overview pt 1 - no gui
Multi overview pt 2 - gui
Fix some things