Following rules have been applied:
- script starts with shebang !#/bin/sh followed by blank line,
- script ends with exit 0 prepended by blank line,
- only stderr of adduser, addgroup or passwd is redirected to /dev/null,
- getent passwd/group instances has been removed,
- manual checking of file and group existence has been removed,
- `|| true` instances has been removed.
Comments and line wrapping have been preserved.
The pre-install script assumed the thttpd group already exists,
but it doesn't and thus adduser -G thttpd will fail, leading to a cascading
failure in the pre-install script.
