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!
- Add support for reordering columns in a table (fix#5942)
- Add support for expression based columns
- Add support for setting column alignment (fix#2957)
- Add support for setting column header alignment
- Make sorting in tables correctly handle nulls, dates, times, locale aware string sorting
This work also paves the way for future expansion of attribute tables to allow for setting column widths, column colors, etc.
- 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
