Add scripts to set up a dummy development environment (i.e in an ubuntu virtual machine) without sensors

[maglub]

To speed up the development process of the GUI, it helps to have a dummy environment in a virtual machine.

• Setup of /var/lib/piLogger
• Setup of /var/log/piLogger
• Setup of dummy sensors
• Setup of dummy data for sensors

There are two alternatives:

• Using completely made up data
• Duplicating an environment (i.e. a refresh from your "production raspberry pi"

The main issue with the latter, is that you cannot just copy the .rrd files, since the raspberry pi has a different endian than an x86 ubuntu, so you will have to dump the content to xml, then import it.