* src/plugins/relcalc.glade: don't do connect in glade, we need key
* src/plugins/Leak.py: use os.sep, not + '/'
* src/plugins/RelCalc.py: Don't keep recalculating relation map of the
active person, do it once. 50% faster. Make sure all objects can be
collected by the garbage collector
* src/Relationship.py: allow to connect to database. Map of first
person is stored, only to be removed if database changed, or it
concerns a different person. This reduces calculation with 50%
* src/DisplayState.py: don't recalculate home person every time, don't
call relationship calc on every click, only call it when the people
are different
svn: r9383
