better volumetric skin

With some more tests it seems the volumetric skin may benefit from less density to better match the iray translucency effect from strong backlights. Below the equations that are the same as ~~#24~~ I just changed the density factors.

# if there's transmission then use volume absorption
if transmitted color <> black/white
    use volume absorption
    color = transmitted color
    density = 100 / transmitted distance

# if there's sss then use volume scatter
if chromatic sss color <> black/white
    use volume scatter
    color = invert(sss color)
    density = 50 / scattering distance
    anisotropy = sss direction
# please note that sss amount can also be > 1 in some characters
# this is fine since color slots accept values > 1
if mono sss amount > 0
    use volume scatter
    color = sss amount
    density = 50 / scattering distance
    anisotropy = sss direction

Also an example with V8 for the ears and fingers with a strong backlight. First iray then the plugin before and after the fix. Scene included.

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