undocumented translator fixes

[Eric Dean Tribble <tribble>]

yes that's certainly a good idea.  Unfortunately, the translator is
sufficiently distributed that changes can have non-local effects.
Recording a change change to parsing of types will play havoc with the
translation of casts, for instance.

Ah.  If peopple modify the class comment in HxxPrintStream, then it's
sufficiently global that we can detect damage from remote changes.

Any objections to everyone doing that?

dean