Log Message:
Changes 0.50:
- A lot of internal code cleanup and bug fixes.
- Added a dialog for creating new blank floppy disk images.
- The source code has been optimized for better emulation speed.
- Added RS232 emulation (still very experimental and not very well tested! It
  seems not to work reliable yet. Help for debugging is very appreciated!).
- Some bugs in the 68000 emulation have been fixed.
- The emulator now checks for double bus errors and stops the emulation if
  necessary (instead of crashing the emulator).
- Timer-D is now patched correctly again.
- The old font has been replaced by two new fonts so that the GUI now looks
  better in high resolutions.
- The fonts are now linked into the executable.
- Added support for DIM floppy disk images.