Comment 5 for bug 823061

@pitti @jbicha I sent this merge request about 15 days before the UI freeze, but unfortunately it has not been possible to merge.

I know that just moving two indicators is not a priority thing, but it is a main rework of all the indicators infrastructure that should also give better performances and less memory usage.
Also, from a development point of view but this will also allow in future to easily make system indicators and put them in the right position without using libindicate directly, but with a simple app-indicator.