slicc: have a central mechanism for creating a code_formatter.
This makes it easier to add global variables like protocol

ruby: Added message type check to OutPortDeclAST.py

Though OutPort's message type is not used to generate code, this fix checks
that the programmer's intent is correct. Eventually, we may want to
remove the message type from the OutPort declaration statement.

slicc: Pure python implementation of slicc.
This is simply a translation of the C++ slicc into python with very minimal
reorganization of the code. The output can be verified as nearly identical
by doing a "diff -wBur".

Slicc can easily be run manually by using util/slicc