* fix handling of relative pathnames passed via -d * update the current script (not assuming it is	located	at /usr/bin/rpi-source) and keeps its ownership	and permissions.
* fix handling of relative pathnames passed via -d
* update the current script (not assuming it is	located	at /usr/bin/rpi-source) and keeps its ownership	and permissions.

lifanxi/rpi-source,cybercircuits/rpi-source,notro/rpi-source