Correct and clean up init.d script

Correct and clean up init.d script

Based on the changes from chrysn@fsfe.org, I had a closer look at the
init.d script and propose to change it like this:

 - Use correct path to program (/usr/bin, not /usr/sbin).
 - Stop running as root, run as user calypso, and move pidfile to a
   place writable by this user.
 - By default, only listen on 127.0.0.1.
 - Remove unused / disabled code.
 - Change indentation from spaces and tabs to 4 spaces.

Signed-off-by: Guido Günther <agx@sigxcpu.org>