[Azoth Murm] Use PhotoMap2Info().
[Azoth Murm] Get & store thumbnail size for #1283.
[Azoth Murm] Store full photo size as well.
[Azoth Murm] Set thumbnail image width/height for #1283.
[Azoth] Install scroll handler on DOMSubtreeModified as well.

Fixes #1283.
Merge branch 'master' of github.com:0xd34df00d/leechcraft