Suggestion for updated install pkg

[Sailoog]

The problem here is that we need to modify some files and parameters of the system, not just installing dependencies to build openplotter.

The NOOBS version of OP 0.10.0 does not work for disk/usb installation but latest ones do. I think NOOBS is the best way of distributing OP but we will try to built an img file too for next version (stretch).

Anyway I have never used pkg, have you? any test with OP?