sfrotz -h and -w options work with pixels, not characters

[DavidGriffith]

I noticed that the -h and -w options for sfrotz don't work as they do for the curses and dumb interfaces. They specify pixels instead of characters. This should probably be fixed, worked around, or have options for setting pixel dimensions moved to other options.

[tkorvola]

Screen units are pixels in sfrotz. Specifying pixel dimensions is more natural for V6 games, maybe also for others if the main font is proportional.

Each front end parses its command line independently, thus small inconsistencies are hardly surprising.