[Libguestfs] [PATCH] generator: Introduce error code (errcode) concept.

I have pushed this, this is just FYI. See the end of the patch for the new type and functions introduced into the generator. Passes all the tests, but should still be treated with a bit of suspicion. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones libguestfs lets you edit virtual machines. Supports shell scripting, bindings from many languages. http://libguestfs.org