DIB Engine - Patchset separated by original author

[Massimo Del Fedele]

As asked to me, I have separated the dib engine into a patchset, trying 
to keep (when possible) the original author's submissions, so Huw 
Davies, Jesse Allen and me.
I had to change some of other author's commits in order to fit my engine 
and to rebase it on 1.1.14, so I ask both previous authors to check if 
they agree on the patches.

I hope this will help the review, as keeping it rebased on wine tree 
will become quite hard having it as a separated patchset.

Attached here is a zipped patchset, which apply on wine 1.1.14.

Ciao

Max