Until now "map units" in snapping config dialog actually referred to layer units.
From now on, "map units" refer to project's CRS units. Where appropriate, it is
possible to choose "layer units" that refer to layer CRS units.
Projects from older versions of QGIS should be handled seamlessly (tolerances
in layer units will be still handled in layer units, not project units).
In API, QgsTolerance::MapUnits is deprecated as it is unclear to what units
it refers to (should be ProjectUnits, but actually it is LayerUnits)
- update methods of existing classes
- add comment to methods missing in the sip bindings
- split up collective sip files into single files and use
same directory structure in python/ as in src/
- add a lot of missing classes (some might not make sense because of
missing python methods in those classes)
- remove some non-existing methods from the header files
- add scripts/sipdiff
- replace some usages of std::vector and std::set with QVector/QSet
