save-file in bitmap%
Saves a bitmap in the named file.
( -> boolean
send a-bitmap save-file name kind)
name : string
kind : symbol in '(xbm xpm bmp pict)
The kind argument determined the type of file that is created,
one of:
'xbm -- save an X bitmap file (X, Windows, Mac OS)
'xpm -- save an XPM bitmap file (X, Windows, Mac OS)
'bmp -- save a Windows bitmap file (Windows)
'pict -- save a PICT bitmap file (Mac OS)