Änderungen

Fixed type handling for boolean operators
Comparing values of different types except integer and real was somewhat 
broken. Now it parses common.j to extract a type hierachy and uses the 
lowest comman ancestor on that tree to insert the correct conv 
instructions. With this change we also put the type hierachy into the 
compiler state and write it to disk.
 (commit: 1819f2b)

Remove temp register for not instruction via rewrite rule
 (commit: 9e204e8)