Opcode extensions
- "--opcode": User opcode extensions. It is now possible to add a custom format for e.g. RST 08 in ESXDOS.
- Branch labels that jump into the middle of an opcode adjusted. These use offsets now (e.g. "JP LBL1+1").
- Warnings added for wrong branch labels.
- Warnigns added for code that is accessed as data (self-modifying code).
- Corrected handling of apostrophes in argument files.