pb_EnvelopeByDistance and pb_WeightByDistance

An update on pb_EnvelopeByRadius: http://vimeo.com/84025815 since I was feeling the need for more per null options.
Also one to use with single Weights
Compounds and script found here: http://si-community.com/community/viewtopic.php?f=19&t=4897
The script can be very slow to run (no idea why) and should be applied without the compound inputs and outputs being connected.