author_pane 6.x-2.0-alpha2

Changes since Alpha 1:
#566750 by abaddonsun, Michelle: Added check for private groups and also added ability to disable the preprocess entirely.
#525190 by Michelle: Added dummy function to define API for disabling preprocesses.
NOISSUE by Michelle: Updated README.txt to reflect latest changes.
#542998 by Michelle: More work on processing the user picture image.
#542998 by Michelle: Changed the included Panels content type to use the new theme function format.
#542998 by Michelle: Missed changing the default configuration variables in the Panels content type.
#548438 by introfini: Added check to see if user can add a given relationship type.
#537462 by dafeder: Corrected UR variable docs.