vi bug fixes

[Paul Fox]

someone just asked me privately for this:

 > can you also add the + option  ?

unless vi's option processing switches from getopt(), that's not
trivial, and i probably won't do it.  (besides -- i never use
that option.  ;-)

in the meantime, use "vi -c NN" for the same effect.  except that
there's a bug that prevents the result of -c commands from
displaying properly -- you need to type ^L to refresh the screen
immediately after starting vi.  (i've just committed the fix for
that.)

i also fixed the usage() message so it now displays commandline
options correctly.  (all it would show before was vi's internal
help text.)  this may make it more obvious that the '-c' option
exists.

paul
=---------------------
 paul fox, pgf at brightstareng.com