Frsky flicker fix, and close encounters beacon tune.

Your suggestion fixed the frsky telemetry flickering. http://www.youtube.com/watch?v=8piVErrzr5c

http://www.youtube.com/watch?v=oyP8kihXckY
A few people like it, and I am about to put a vid up demoing the beacon with this tune. http://youtu.be/6p6_OFj-V54
In practice I found the 5 different power levels more useful. The last tone also is longer than the rest.

beacon tone has been changed for higher resolution.

frsky.h and common.h are only relevant. am still getting my head around github so not sure why all the other changes are there.