mtecs/wind: store wind variance
Remove old TECS implementation - we can really only decently flight-test and support one.
geo lookup lib: Moved to separate module and compiling with -Os to save some precious flash
Comment fix in perf counter header, no code changes.
Enable new lookup lib
Merge pull request #1085 from PX4/geo_flashefficiency

geo lookup lib: Moved to separate module and compiling with -Os to save ...
Merge pull request #1084 from PX4/mtecs_pure

Remove old TECS implementation - we can really only decently flight-test...
Merge remote-tracking branch 'upstream/master' into mtecs
Merge remote-tracking branch 'upstream/mtecs' into navigator_rewrite