"context restriction not allowed for fully polymorph instance" and
"context restriction equals instance type"

"PA_BUG" for the same purpose. MW removes his macro _untertaenig_ in favour
of Sjaaks version

   in "convertCasesOfFunctionsIntoPatterns" and "collectVariables")
 - new switch "SwitchUniquenessBug" in module checksupport
 - several bugfixes

    (new module: comparedefimp)
- implemented array patterns. Further work: arrays are in lazy context (should be strict),
    currently only one dimensional arrays
- optimised memory usage for explicit imports