Add blend mode option for features, allows blending to be used between features in a layer
[feature] Layer transparency for vectors (fix #7692)
[feature] blend modes for composer map grids (fix #7777)
[feature] Add font color control for grid annotations (fix #7789)
Tests for grid blending, grid color labels, vector feature blending and vector layer transparency
Add python bindings and tests for grid blending, grid annotation font color, vector feature blending and vector layer transparency
Fix build error
Merge pull request #590 from nyalldawson/advanced_composition

FFE? some blending fixes & composition feature requests
Add clamp and scale_exp functions
[sextante] fixed issue in GRASS installation test
postgres provider: avoid noise when layer_style table doesn't exist
postgres provider: fix b85af12c
Reactivated 8bit and 1bit mode for QGIS Server

The commit 76d1f955c019c3d42cbab29ce2d147acd233b54a simplified the
mFormat private attribute to PNG, JPG, PDF, etc and created
mFormatString attribute. The second is used for base64 but not for mode.
This commit corrected it.
Add image/png; mode=16bit as a supported format
Activating WMS getStyle REQUEST for .qgs mapfile

A getStyle REQUEST has been developped for SLD mapfile.
qgsVectorLayer has a method writeSld. It was easy to activate getStyle
for .qgsmapfile
skip raster nuller with color types; check data block allocation in block value read, fixes possibly #7807
- integrate function_help and context_help to translation files
- add some german function help updates
- update helpviewer to show help passed into stdin from qgis
Add field calc to main app window
Refactor activateDeactivateLayerRelatedActions
- recover japanese translations lost in 4b76600
- german translation fix