fix pull request #227 - running over engravings

fix pull request #227 - running over engravings

Fixes #227

Travel, <ctrl><direction>, <g|G><direction> all stop on engravings,
but <shift><direction> told the player what the engraving said and
kept going.  The message output is buffered until map update or
another message, so player couldn't tell where hero was at the time
the engraving got shown.  Make <shift> running stop on engravings.