Re: [rfa] generate fully-qualified names for types

[Elena Zannoni <ezannoni@redhat.com>]

As usual I'd like to split this patch in mechanical
changes/replacements and not so mechanical ones.  After the mechanical
changes are in, it would be more obvious what has changed.
It looks ok to me, but I'd like to minimize the diffs and take another look.
I can see:
1. the processing_current_namespace --> processing_current_prefix rename
2. the read_namespace changes of previous namespace-->previous_prefix
3. introduction of namespace_name() 

as mechanical/obvious

I can check in those changes if you are busy. I am too, but now I can
swing a day for this.

Other minor nag is about comments, I think we need more examples in
the comments about how the names get composed, etc.

elena