Remove references to 'TXT' in -inform and -outform switches.

some utilities that should have used RANDFILE did not,
and -rand handling was broken except in genrsa.

and to lots of PEM_... functions.
Submitted by: Damien Miller <dmiller@ilogic.com.au>

Submitted by:
Reviewed by:
PR:

Also fix typos in the usage messages: "inout" instead of "input".