by using a SK_OverloadedConstructor instead of a SK_Constructor

no longer necessary because clm supports import code from,
compile module backendconvert with -fusion

export label of node entry for Array methods for arrays of unboxed records if exporting local labels

(while matching types of instances)

this adds local functions of instances and generic cases to the ifi_local_function_indices,
in order to check the kinds of these local functions

by using the reversed groups (constructed in reverse order)

if a constraint of a class without members is reduced, and all classes in the constraint of that class appear
in the reduced constraints for a variable, add a constraint for the original class for that variable
(this causes removal of the other constraints later), to prevent functions with too many constraints

(the type definition has a * on the left),
add Bool to GTT_Constructor to indicate uniqueness,
generate TCE_UnqType in TypeCode for unique GTT_Constructor's,
this uniqueness property should be propagated, but this is not implemented yet

to the list of all type attributes
(not adding these type attributes caused a type error),
this also happens for function types that are specified by the programmer,
the universally quantified type variables are however not added to the list of all type variables

using this information the code generator can determine from which
module a label is imported, this is used when generating position
independent code

for example: [0 \\ [] <- [[]]]

makeConsExpressionForGenerator, makeNilExpression and makeConsExpression

(undo: check the type of instances defined using :== (maybe the parser should reject these instances))

this is necessary because in module type_io these pointers point to TVI_Normalized values that
could be overwritten by this function

argument fun_type of function determineProducers was changed by a record pattern match,
rename the argument to consumer_type