perl 4.0 patch 35: (combined patch)

perl 4.0 patch 35:  (combined patch)

Subject: bad interaction between backslash and hyphen in tr///
Among other things, tr/\040-\126/ / was not doing a character range,
due to a earlier botched fix to make \- work right.

Subject: Configure test for presence of nroff was wrong
If Loc doesn't find nroff, it sets $nroff to 'nroff'.  The man
page test was tesing against the null string.

Subject: installperl error message printed file mode in decimal, not octal
A real, honest-to-goodnes nit.

Subject: fixed up some filenames in MANIFEST
Erroneously contained "pstruct", omitted hints/isc_3_2_3.sh.