Bugfixes

Fixed: SPLIT returned wrong array length
Fixed: POLYVECTOR with mode == 1 and no POLYNEWSTRIP crashed
Fixed: POLYVECTOR messed up VIEWPORT
Fixed: "Hugo" < "Manfred" evaluates as expected (<,>,>=,<= are
overloaded properly)
Fixed: Arrays with ref that were not initialized with DIM/REDIM had
wrong defaultval (caused to problems with strings for example)