OGR provider: deal with wkbUnknown25D (wkbUnknown | wkb25DBit)

This geometry type doesn't exist admitedly in the OGRwkbGeometryType
enumeration but a few OGR drivers can expose layers of this type.
Those layers should be dealt exactly like wkbUnknown layers, i.e.
QGIS should analyze the content to see if there are points, lines,
polygons and create derived layers.

Also report the geometry type of wkbGeometryCollection25D layers in
the U.I.
Remove alias from vector layer if it's an empty string
[composer] Locked items can't be selected by clicking them in the canvas.
[composer] Deselect items when they are locked from the items panel
[composer] Decrease default snap tolerance to 5 pixels
fix editing of NULL values (fixes 0 to NULL, and fixes setting of NULL values in postgres)
Fixed Legacy date widget default format
[composer] Don't deselect items when unlocking them from the items panel
[composer] Some tweaks to label display name, add display name for legends
[processing] replace str() with unicode() to avoid possible issues with
non-ASCII characters (work in progress)
[processing] fix loading of output rasters with wrong CRS
debian packaging update
Merge pull request #1524 from SrNetoChan/master

Fixed Legacy date widget default format
Fix #10988
Attribute table cache size 0 is represented as "All" in the options
Fix memory leak and pass ownership of py editor widgets to C++
respect restrictions when calling identify with layer selection mode
fix zooming to layers when there are empty layers
[FEATURE][composer] Allow more control over appearance of composer arrows:
- Line can be styled using line symbol style dialog
- Arrow head fill and outline colors can be specified
- Arrow head outline width can be specified
[processing] convert strings to numbers when initializing parameters
from description file (fix #11011)
Finding python library on Ubuntu 14.04 64bit