nsf.c

- nx.tcl: * full rewrite of slot machinerie, much simpler structure * relation handling via parameter aliases instread of pseudo converter * mixinclass SlotOptimizer removed * new class BootStrapAttributeSlot
- ConvertToRelation() and handling of parametertype "relation"
- Make CompiledColonVarFetch() more robust in case of
half initialized objects (create vartable on the fly if needed)
- allow empty parameter options in parameter parser
- removed nsf::parametersfromslots (became simple, part of objectparameter now)
- removed hardcoded objectparameter (attributes, volatile and noinit)
- updated regression test