*Fixed a bug with POV replacement code introduced with latest addition of colored spec.

*changed default values for the folowing properties to be more useful in most scenes:
- radio_low_error_factor
- fake_caustics_power
- importance_value

git-svn-id: https://svn.blender.org/svnroot/bf-extensions/trunk/py/scripts/addons@4556 96b784f8-4ae3-dd11-aff7-0030488c597c