OLEAUT32: add full multiplication/division support for DECIMAL (in small patches)

[Dimi Paun]

From: "Alex Villací­s Lasso" <a_villacis at palosanto.com>

> By popular request, I am resending the implementation for DECIMAL
> multiplication/division in small patches.

Good, but please send one patch per email.

-- 
Dimi Paun <dimi at lattica.com>
Lattica, Inc.