Apply new master/slave scheme.
Update master port (editors/bitmap) for emacs21.
Update slave ports (editors/bitmap-mule and editors/bitmap-emacs20)
to stub ports.
Install el/elc files to version specific site-lisp directory.
Change some style.
Bitmap-emacs20 has following modules:
- bitmap.el: kernel of bitmap-emacs20
- po.el: tiny BDF font editor
- smiley-mule.el: smiley-mark encoder/decoder
