activated by defining 'newst', but doesn't compile yet. Changes in type
checking and oop are completed. What is left is to write a new
symtablestack and adapt the parser to use it.
+ dataflow analyzer finished
+ start of CSE units
+ aoptbase which contains a base object for all optimizer objects
* some constants and type definitions moved around to avoid circular
dependencies
* moved some methods from base objects to specialized objects because
they're not used anywhere else
