better packaging for microscope software

[codeTom]

It might be useful to have an apt repository for microscope software, that way we could handle dependencies and upgrades more easily as well as simplify installation as deb scripts could setup memory split and enable the camera, so the whole thing can be installed with a single command on a clean raspbian system.

[rwb27]

hmm, that is a nice idea. I've not read up on how to properly package Python stuff for apt, and the obvious catch is that at least one of the dependencies (readchar) is not (I think) available as a debian package and I'd be a bit chary about running pip in a deb script...

Perhaps a sensible way to go would be to either drop readchar in favour of pygame, or to make it a soft dependency, as it's only there for interactive control.