Dynamics todo

* ModuleID-node sharing for one module
  compiler, more efficient
* dlink and DynamicLinker expect to be
  placed in the path of the CleanIDE
- move type definition normalizer from checker to convertDynamics.
- compiler, overloading let_ptr-function needs as arg the number of bindings like
  in convertDynamics.

CLEAN COMPILER
==============
- sharing of type part of dynamic

TYPE EQUIVALENCE
================
- type variables of type definitions which were previously (before version 1.21)
  normalized have been removed by Sjaak and have not yet been added again in 
  convertDynamics. As far as I can determine the normalization is performed but 
  I am not entirely sure.
- type synonym expansion (String)

CONVERSION FUNCTIONS
==================== 
graph_to_string:
- convert runtime lazy_dynamic_index of build_lazy_blocks which already exist in the
  graph to disk blocks.
- cache parts of the graph which are lazily read from a dynamic
  If there are at least two lazy references to a single dynamic and the block to which
  is refered share a common block, then the current implementation cannot yet detect 
  this.
- laziness in RunTimeIDs
- ids of build_lazy_blocks which already existed must be converted to disk ids
- CopyGraphToStringArguments and CopyGraphToStringResults *must* appear in type equation
  (request.icl, like realtje)

COMPILER
========
- merge forgotten bit of predef

DYNAMIC LINKER
==============
- clean up sources
- library instance sharing (don't know if possible)

STATIC LINKER
=============
?

_SystemDynamic
==============
- split-up in library-part and StdEnv-part