Fixes com Z80.cxx

[efraga-msx]

Mike,

I fixed some issues on Z80.cxx:

- there's no ld (hl), bc
- there's no ld b, (hl+1), you should inc hl first
- there's no ld d, (hl+1), you should inc hl first
- jr z label_ --> jr z, label_
- label_x   --> label_z:

Other changes are there because my editor removes trailing white spaces.

Thanks.