They are unreliable because every type checking cast discards them, they are useless anyway, visual clutter, added inconsistently, and generally suck. Wanted to do this a long time ago, it was a bad idea in the first place.
Also do some refactoring in the align tool, like adding gimp_align_tool_halt() and using it to shut down the tool.
and add a (still unused) text layer picking function.
