cmd=testAngleDiff
ang1=20   ang2=40   # diff=20
ang1=40   ang2=20   # diff=20
ang1=20   ang2=20   # diff=0

ang1=0    ang2=0    # diff=0

ang1=360  ang2=0    # diff=0
ang1=360  ang2=720  # diff=0
ang1=359  ang2=1    # diff=2
ang1=1    ang2=359  # diff=2
ang1=-2   ang2=2    # diff=4
ang1=-160 ang2=160  # diff=40
ang1=-200 ang2=160  # diff=0
ang1=-202 ang2=160  # diff=2
ang1=-0   ang2=0    # diff=0
ang1=90   ang2=270  # diff=180
ang1=0    ang2=180  # diff=180
ang1=270  ang2=90   # diff=180
ang1=180  ang2=0    # diff=180
ang1=180  ang2=-180 # diff=0
ang1=180  ang2=315  # diff=135
ang1=271  ang2=269  # diff=2
ang1=269  ang2=275  # diff=6