Real (not as buggy) indirect painting

[Bart Coppens]

Thanks to some discussions with Ilmari Heikkinen (kig) on IRC, I got 
interested in making the indirect painting work more like people expect it, 
and less buggy.

Basically, the most complained about problem with the current implementation 
is (other than being hacky) that it still does not handle pressure-varying 
opacity correctly. Another problem is that it, in fact, didn't handle 
paintops other than OVER correctly. I even think that it didn't work at all 
with layer masks and adjustment layers.
The first was partly solved by Ilmari by introducing a 'darken alpha' paintop, 
and implementing it for rgba8. So I decided to see if I could make that work 
better, and make the rest work, by getting rid of the temporary layer in the 
layer stack, and replacing it with a temporary paint device inside the paint 
layer itself.

Attached is a patch (combined with Ilmari's alpha darken) that fixes it for 
regular paint layers (so no adjustment layers, masks or selections yet). I 
think it's a bit hacky as well, but replacing something buggy and hacky with 
something working and hacky might be worth considering for 1.6, Cyrille?

If this would get greenlighted for 1.6 I'll see what I can do about making 
this work with masks and adjustment layers (and other colorspaces).

Bart
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