First bounty: Update Notifier

One of the things Geist Geld desperately needs to avert various unfavorable experiences down the line is a means to somewhat meticulously and insistently (within reason) notify the user if the majority of peers he is connected to have a version different from his own.

This will help to draw the user's attention to the fact that his version is lagging behind the general Geist Geld frontier and he'd better catch up until something bad happened.

The bounty on this one is 69 777  Geists, and of course proper credit in the  Contributors section of the website (which gonna go up real soon)

Meanwhile, I would ask the kind community to provide feedback as to possible pitfalls and implementation suggestions.

Thank you very much in advance