* src/Relationship.py: many improvements and bug fixes
* src/plugins/all_relations.py: bug fixes
* src/plugins/RelCalc.py: use new API
* src/plugins/rel_nl.py: finished, removed comment
* src/plugins/rel_it.py: finished
* src/plugins/rel_pl.py: move old code here away from Relationship
* src/plugins/rel_pt.py: import gen.lib
svn: r9367