Get rid of a couple of copies of the CC0 text. Add header comment to
CC0 files to remind people editing them what the terms are. Also add
some missing XML headers. The header comments in layouts won't bloat
the binary - they get stripped out before compressing, same as any other
comments.
- moves ec184*, iskr103* and mc1502 out of pc.c
- moves CGA font upload support to a subclass
- adds new drivers: poisk1, ec1847, pk88
- adds a skeleton of native iskr103* keyboard
i8089: implement remaining instructions and support execution from "io" space. [Carl]
(mess) isbc-215g: add intel isbc-215g hdd controller, read only for now [Carl]
(mess) isbc: add hdd support to isbc2861 (nw)
