Rationale:
- there was a lot of large objects passed by value, so potentially
there's a speed bump from this
- even for implicitly shared classes like QString/QList there's still
a (small) cost for copying the objects when there's no reason to
- it's the right thing to do!
This is much faster way of initializing a spatial index. From python it is as simple as
>>> index = QgsSpatialIndex( layer.getFeatures() )
From a simple test with 50K points in a memory layer:
- bulk loading ~ 100 ms
- inserting features ~ 600 ms
The index tree should be in theory also better constructed and may result in faster lookups.
- 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
