Fixed for facebook profile pics.

Now uses a facebook graph API query to safely get profile icons.
The approach works for profiles but not other pics since
profile pics don't require an authentication token (since
they're public).  This also means it doesn't suffer the 'indirect'
speed hit of regular photos.
Facebook fix for external images, some instances of profile pics, etc.

Overall its working pretty well now, though in Theater mode
view of photo, hovering Link & other links shows pop-up.
minor clean-ups/fixes related to facebook
v3.2beta8