darkstat: [18.06] procd init script and enabling additional parameters

darkstat: [18.06] procd init script and enabling additional parameters
This is the same change as the one on master
This is to change the init script to a procd init script
This also enable some additional parameters in the binary that
were present but not enabled:
The export file (option export_file)
The import file (option import_file)
The daylog (option daylog_file)
These are disabled by default.  Also, the option to run as a daemon
is removed, as not compatible with procd.

There is no change in the binary.

Signed-off-by: Jean-Michel Lacroix <lacroix@lepine-lacroix.info>