Goldwingu:Means to End v.0.39 file

Changes in version 0.39:

- Enemy appearances revamped: number of waves increases every level and waves which score more points come later and in greater numbers.
- Explosions tweaked.
- One new enemy; added to end. Fires homing missiles.
- New option for turning off the inertia movement (default off) (10% bonus points if on).
- New option for trying a one hit challenge (single hit kills, default off, 100% bonus points if on).