#113 Let's change hotkeys to match Col1

[Fenyo]

We have all agreed this modification on developer mailing-list before,
so please merge it.

I have tested it, and Clear Forest Action and Plow Action does not conflict.

Repositories/Branch:
https://sourceforge.net/u/fenyo1/freecol/ci/hotkeysCol1/
https://github.com/fenyo1/FreeCol/tree/hotkeysCol1