Change some Properties of BMP085 module to be Settings.
Use faster boost::circular_buffer<> instead of vector+rotate.
Don't use confusing is_singular(). Introduce .configured().

Property.configured() should be used for properties you want to write to.
Remove unused and not-so-useful module that can work only on floats.
Fix parsing of settings in io/bmp085.
Add ets-airspeed module (Eagle Tree Systems).
Limit dt when smoothing.
Let PropertyObserver compute update_time() and update_dt() on its own.
Various config updates and other fixes.
FDC should compute smoother IAS from airspeed sensor.