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
Fixed Legacy date widget default format
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
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)
Let user change form layout in fields properties if .ui is not empty
Don't set field value to NULL if multiline text edit has not been edited
raster layer properties: add data url label
server: fix absolute path conversion on windows
[TRANSUP] common string update

Signed-off-by: Werner Macho <werner.macho@gmail.com>