#2 Fix HeapWordSet
#2 Fix ArithmeticWordSet
#2 Fix InterpreterWordSet
#2 Fix MiscWordSet
#2 FixSQLWordSet
#Fix StackWordSet
#2 Fix StringWordSet
#2 Fix VaadinWordSet partially

Also changed the general WordSet structure, as the old one didn't play
nice with Eclipses content assist.
#2 Fix reset of VaadinWordSet