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Half-Line Motion
================

   Some terminals have commands for moving the cursor vertically by
half-lines, useful for outputting subscripts and superscripts.  Mostly
it is hardcopy terminals that have such features.

`hu'
     String of commands to move the cursor up half a line.  If the
     terminal is a display, it is your responsibility to avoid moving
     up past the top line; however, most likely the terminal that
     supports this is a hardcopy terminal and there is nothing to be
     concerned about.

`hd'
     String of commands to move the cursor down half a line.  If the
     terminal is a display, it is your responsibility to avoid moving
     down past the bottom line, etc.