Change: display nr of services in column header

Instead of a status line as a docked component at the bottom
of the service list, now the number of services gets displayed
in the column header. Saves screen space and render time.
Fix: selecting networks change displayed services

Selecting networks in "Eigene Netze" should cause a reload on
the service store with current params.
This was not the case but is fixed now and solves issue #9.

Removed unused code in controller/Network.js.

Moved common code from controller/Main.js to controller/Service.js.