fixed HGR fringing
fixed fwrite / fclose causing SEG faults under Linux
added monochrome switch - only for HRG
Function keys have been re-mapped - see README.md for details
you can save disk 0 and disk 1 now
disk filesnames are now displayed on the title bar
added puce6502DumpRegs() and puce6502DumpPage() for troubleshooting
cleaned code, added more comments
