Open Office 2d10 combat probability calulator

[Courtenay]

Here is my 2d10 calculator. It includes everything that I can think of that influences combat, including whether there are invading troops, whether there is a required loss, whether the defender has a retreat available, and whether the attacker intends to convert shatter/breakthrough results to retreat.

I must admit that I found a bug only three days ago, so there may still be others. If anyone finds a problem, please let me know.