Fix: allow R to be restarted
Fix: allow R to be restarted

The OOM killer (or other process) have been killing R
and systemd restarts it BUT if we manually pass the pidfile
in then it seems like the parent process doesn't pick up the
restarted R.

Fixes #800

npct/pct-shiny,npct/pct-shiny,npct/pct-shiny,npct/pct-shiny,npct/pct-shiny,npct/pct-shiny