Correct references to configuration files

[Igrom]

While the install.py script expects to find the machine-specific configuration file under conf/{system}/sink.conf, the actual configuration file is located at conf/{system}.conf. This trips up the installation script, at least has for me.

[chadmed]

Thanks for spotting that. I changed the directory that it looks in but not the one that it actually tries to copy the files out of :P