Layout of compiler
-------------------




compiler a file:

run convert.php (PintCompiler_convert)
- reads command line options.
- loads the Generator core (Pint_Compiler_Generator)  = data store for tree
- creates a base Function main (PintCompiler_Generator_Function)
- loads Parser (PintCompiler_Parser) which in turn loads the tokenizer (???)
- loads the Nodes (PHPSharp_Node_*) Nodes.php which contains all the classes
  that store the tree nodes.

- call the parser - creates 
    PintCompiler_Generator_Function with statements (the tree of nodes)
    stores it in PintCompiler_Generator

runs emitImc on the Functions / which in turn calls the emit methods from
    Nodes/Node.EmitImc.tc
    returns the code..