(to have fewer differences with the haskell frontend branch),
the conversion table for macros is not used after checking

remove conversion table, except for macros

concerning specified instance types, that by far go beyond the standards
of Clean 1.3.3

checking of a whole dcl module component --> now cyclic module dependencies
should work

really redundant, but not those which are added automatically by the compiler
to the icl module

    (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