Revert "[REMOVE] twitpic support is removed"
This reverts commit 936eba5.

And excluding the change for "options_backend.js".
So, default setting is changed to "pic.twitter.com".
[FIX] popup menu is not enable in expanded tweets
[FIX] broken list path
[FIX] enable tooltips without url expanding
[MODIFY] reduce URL expanding
[WILL REBASE] change for new identification of list