The desktop-file-valide utility reported the following issues:
```
debian/qbrowser.desktop: hint: value "Qt;Education;Science;Geography;" for key "Categories" in group "Desktop Entry" contains more than one main category; application might appear more than once in the application menu
debian/qbrowser.desktop: error: value "map;globe;postgis;wms;wfs;ogc;osgeo" for locale string list key "Keywords" in group "Desktop Entry" does not have a semicolon (';') as trailing character
debian/qgis.desktop: hint: value "Qt;Education;Science;Geography;" for key "Categories" in group "Desktop Entry" contains more than one main category; application might appear more than once in the application menu
debian/qgis.desktop: error: value "map;globe;postgis;wms;wfs;ogc;osgeo" for locale string list key "Keywords" in group "Desktop Entry" does not have a semicolon (';') as trailing character
```
Only the Keywords syntax error is addressed, the Categories hint is left as-is.
The menu files are no longer required for the Debian packages since
[CTTE #741573 Debian Menu System](https://lists.debian.org/debian-devel-announce/2015/09/msg00000.html)
which advised:
> 2. In addition to those changes, the Technical Committee resolves that
> packages providing a .desktop file shall not also provide a menu
> file for the same application.
The postgres provider is modified so that layers with
TIN, PolyhedralSurface and Triangle geometries can be loaded.
Geometries are converted to MultiPolygons (and Polygons for Triangles).
The postgres test is completed to cover the loading of different types
of layers
With a lot of geometryless layers in a project reindexing on every mousemove
makes the UI unresponsive and brings up a "indexing layers" dialog with
progress bar repeatedly.
- use at() instead of [] for temporary containers (at() returns
const reference, so it avoids the detach which occurs with [])
- use at( 0 ) rather than first() for containers, because first()
detaches (Qt5 introduced constFirst()/constLast() to overcome this)
