added tostring for renamepair in the AST
changed the parsing of rename pairs: switched to and from
Removed system out prints from the type checker
added better test for renaming

one test is still failing: actions-0038, unclear about semantics of {} and {||} maybe the check of complete args must be switched.
fixed channel name check for comprehensions/eumerations

~~~
channel

c:int *int

{c.1}
{|c.1|}
~~~
now ```{c.1}``` fails
fixes #211 for state type detection. A deref as missing for an updatable value. The model has other issues which has got its won issue #212