Implemented handling of small (<25) sensor readings in the simple sensor model.
Merge branch 'master' of github.com:deaddog/sw505-code
Fixed the calculation of eta in gaussian sensor model, so that it does not involve the odds/logodds functionality. This is handled by the mapping control.
Changed the average obstacle depth from 10 to 30 cm.
Fixed the negation issue in the gaussian sensor model by moving a '-' symbol.