Noshields command; hints fix

(from Aelius)

OK, just two tiny things:

- Small new toggle command, "noshields". If this toggle is ON, then you will not see other players' in-room elemental shield, reduce damage, mirror image, or pass door messages ("JoePlayer stands here ... Surrounded by a spam of elemental shields!" ). You can check the status of this toggle in "config displays".

- The 'hints' display in 'config channels' is fixed - it says OFF when the channel's off, and ON when it's on (duh!) .