#474 disk Gonzzalezz....dsk load az HD disk

[Gergely Szasz]

The Gonzzalezz (1989)(Opera Soft)[+3 Disk][not proper dumped].dsk disk has an unhandled track layout:
Track 0 contains 6x 512 byte len sector and 2x 32k sector (header)
Track 40 contains 7x256 byte sector and a 32k sector (header)

The game load but fuse handle the disk as HD instead of DD.

[Gergely Szasz]

This patch add a new "CPC_ISSUE_6" to handle this disk layout.

(This patch related to [bugs:#450])