Revert "Better detection of when the captcha is open."

This reverts commit 7f32648ed0e837c0adb44e08527837e606526470.
Use a new container for new captchas.
Possibly support copy+paste version of captcha that appears sometimes.

(I haven't been able to test it yet.)
Merge branch 'new-container' into Stable

Conflicts:
	src/Posting/QR.captcha.coffee
remove leftovers
Revert "expand original post form when not hidden (except in catalog)"

It interferes with captcha loading on the original post form.

This reverts commit 66e402031cac75d5d8c96e667bb6e75fb196dc2f.

Conflicts:
	src/General/css/style.css