Introduce simple morale system

Share your thoughts on this morale system.
If you think it is worth and right thing to do then share what else would be good to have?
For now i decided that morale should affect only evasion and accuracy. Not sure about dmg, though logically you cannot raise dmg with morale :D
don't you mean this?
``` python
if ship.hp <= ((ship.max_hp / 100) * 15): ship.morale -= 5 
```
also, I think 25% is okay... 15% is -really- low.