travel targetting via keyboard

travel targetting via keyboard

Some phrase substitution in getpos() or its helpers produced
``Pick a target interesting thing in view for travel''
for 'm _', which sounds pretty awkward.  Change that to be
``Pick an interesting thing in view for travel destination''
leaving "target" implied.

For plain '_', typing '!' yielded
``Using a menu to show possible targets.''
but then nothing happened.  Change that to be
``Using a menu to show possible targets for 'm|M', 'o|O', 'd|D',
and 'x|X'.''
to explain when a menu will actually appear.