make 'req' check the config file syntax before it adds extensions. Added
info in the documentation as well.

consistent in the source tree and replaced `/bin/rm' by `rm'.  Additonally
cleaned up the `make links' target: Remove unnecessary semicolons, subsequent
redundant removes, inline point.sh into mklink.sh to speed processing and no
longer clutter the display with confusing stuff. Instead only the actually
done links are displayed.

detached data encoding was wrong and free up public keys.

under Win32 (9X and NT) again. Note: some signed/unsigned changes recently
checked in were killing the Win32 compile.

from `int' to `unsigned int' because it's a length and initialized by
EVP_DigestFinal() which expects an `unsigned int *'.

Submitted by: Richard Levitte <levitte@stacken.kth.se>
Reviewed by: Ralf S. Engelschall

of 'make errors' without causing huge re-organisations of files when a new
code is added.