MOD : Promotion for Support Units

[mod_3d]

Note:
The mod has been tested on version R29 for developers, but should be compatible with A27 and R28.

Description:

Adds 21 ranks for Support Units.
When a certain amount of resources is gathered, the unit's rank increases.
Each subsequent rank improves the overall gathering speed for all resources. 
The bonus and the amount of resources required grows exponentially.
Example:

Rank  Bonus   Amount of resources required for improvement
2           +1%                          30
3           +3%                          45
...

21        +200%              (approximately 15 minutes when gathering fruit, for other resources it takes 2 or more times longer).

Ranks are not displayed in the unit interface, only the change in gathering speed.

promotion-for-support-units.zip