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.
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
follow up 4fb28987ba
[processing] don't warn about different CRS's if algorithm has only one
input (fix #10964)
Merge pull request #1527 from jarl-dk/build_fix

Finding python library on Ubuntu 14.04 64bit
Merge pull request #1458 from rouault/ogr_unknown25d

OGR provider: deal with wkbUnknown25D (wkbUnknown | wkb25DBit)
new identify method: feature selection
improved menu for identify map tool