[Groff] Debugging info

[Miklos Somogyi]

I'm sorry, I've asked a related question before, but still not ok  
about it.

Request .pnr gives me the contents of number registers, a great help.
Request .pm gives the lengths of all entries in the symbol table.
Not much use to me.
Would like to see strings, not their lengths, and macros/request  
(e.g. .he and .fo in -me) in a bigger detail.
Any way get these things?

Miklos