Update Cowgol Disk Image

[wwarthen]

Update Cowgol disk image based on the latest release from Ladislau Szilagyi.

See announcement at https://mail.google.com/mail/u/1/#inbox/FMfcgzQZTVkZGFCvPzMMnhcCrfBtCCxH.

Also see Cowgol repository at https://github.com/Laci1953/Cowgol_on_CP_M.

[wwarthen]

This is now complete (see commit referenced above).

Thanks, Wayne