Remove upcr_proxy.h reference from translated file.

The generated code targets the interface in upcr.h.
Handle IndirectFieldDecl (Used for anonymous struct/union members).  Fixes #24.
Translate THREADS and MYTHREAD into upcr runtime calls.  Refs #53.
Merge the renaming from branch issues53.  Skip PrintDefines because we've already handled it in a different way.  Fixes #53.