Recursive expansion of pmacros (was: Re: Typo: .substr in pmacros.texi is .substring in pmacros.scm)

[Doug Evans]

Hans-Peter Nilsson writes:
 > As I wrote, I had already startet to depend upon it in a port in
 > progress.  I greatly simplified things (or made it hard in the
 > absence, I should say).

Note that there are otherways to do this, besides the implicit re-lookup.