Document bug in mandos-keygen which strips white space from passwords
Passwords, as read by mandos-keygen when given the --password or -p options, are stripped of white space from the start and from the end of the password. This is because mandos-keygen is a shell script, and the Bourne Shell "read" builtin does not seem to have a way to avoid this. Document this bug.
* manods-keygen.xml (OPTIONS): Document the white space-stripping nature of the --password/-p option, and also note in the description of --passfile and -F that they avoid this behavior. (BUGS): Again mention the problem with the --password and -p options, and suggest --passfile as a possible workaround.