Fix #9658 (crash with diagrams)
Added Denis Rouzaud to authors list
Fix the issues with QTimer start/stop in different thread
Vector save as dialog: use one column layout (like raster save as)
BUG #9674 WFS GetFeature Request does not return features

The GetFeature Request does not return elements.

The response of the request is valid but with a bbox : 0,0,0,0 and no features.
The simple request :
* SERVICE=WFS
* VERSION=1.0.0
* REQUEST=GeTFeature
* TYPENAME=*
* OUTPUTFORMAT=*
return no features.
PEP8 cleanups for some unit test modules
Add some functions to Python unit test utilities
Update label tests to ensure setup happens only once and load/delete only layer to test
Refactor composer label test to work with svg, pdf and multi-resolution classes

- Initial (untested) svg and pdf render-to-image setup