Photos use too many python processes

[Michal Hruby]

Atm photos scopes live each in a separate python process, this is very bad for performance / cpu usage / battery life and should be fixed asap.

[James Henstridge (jamesh)]

We might want to adjust the Python scope-runner script to help with this: the way it loads the Python script makes it difficult to do e.g. relative imports of other modules (presumably we still want to require all the scopes to be merged into a single source file).

[Geoff Teale (tealeg)]

Just as confirmation, I just killed the unity-photo-lens process on my machine because it was causing one of my cores to be running at 100% utilisation constantly (and consuming around 200MB at the time of death). That isn't an acceptable trade-of for something I use only ocassionaly.