Leper's Colony, fixes some issues with embedded videos, and fixes multiple image uploads in the same post

‡ Leper's Colony!
‡ Fewer pointless "network error" messages!
‡ More unspoiled spoilers!
‡ Posts marked read before your very eyes!
‡ "Jump to page" more easily dismissed!
‡ Embedded videos properly embedded!
‡ Embedded videos properly confined!
‡ Embedded videos' audio properly played!
‡ Parsing HTML greatly improved!
‡ Images uploaded straighter!
‡ Multiple images uploaded!