[Nmh-workers] Doing a 1.7.1 release

[Ken Hornstein]

I think we should do a 1.7.1 release, since there are more bugs in 1.7 than
I would prefer.

So, candidates for 1.7.1 fixes?  I'm thinking:

- The fix for the incorrect %(putnumf) truncation
- The removal of the removal of sbr/dtimep.c from 'make clean'
- Maybe fixing the autoconf install directories to not append /nmh?  Not
  sure about that one.

Others?

--Ken