Add methods for converting QgsPoint to and from QPointF and QPoint

Also add some more basic unit tests for QgsPoint
Add methods to QgsGeometry to convert to/from QPointF and QPolygonF
Fix a crash in layer node after removal of layer from registry.

A crash may occur when using custom layer tree in composer legend and layer from that tree is removed from registry.
This would happen only in some code paths.
GRASS 7.1 fixes
[TRANSUP] preparing transition to transifex DEFAULT

Compared translations manually with source and transifex and uploaded every translation with more strings in source to transifex.
From now on only transifex will be pulled and only english source will be updated.

Signed-off-by: Werner Macho <werner.macho@gmail.com>
add GRASS vector layers from browser with map + layer name
GRASS: fixed crash when opening vector without topo
GRASS: points removed from topo in GRASS 7
GRASS: show layers non expandable
remember browser last expanded item
[composer] Use intersection rather than clip for transformed grids

Previous behaviour was to clip transformed grid lines to the visible
map extent. This caused problems if a map item had no border (a
solid line would be shown along the map extent), and also meant
that reprojected lines which crossed out of the map extent and back
in again did not have annotations or grid frame markings shown.

Also implement an improved logic for detecting the map frame side
for annotations.
[FEATURE][composer] Vertical descending direction for annotations

This change adds a new descending vertical direction mode for
map grid annotations. Previously only ascending text was
supported for vertical annotations.