QtConcurrent mask procession - proof of concept

[Sven Langkamp]

Hi,

I have made a proof of concept for using QtConcurrent in autobrush mask
calculation. This is just an experiment for now so it doesn't handle the
corner cases.

If you want to compare it in benchmarks, there is a define that will switch
between old and qtconcurrent code. The number of jobs can also be
configured. I did run KisStrokeBenchmark. On my i5 430 I got a speedup of
1.4 for 60px brush and 1.6 for a 500px brush. I would be very interested in
how it performs on other systems. Maybe you have an i7 or xeon :)

Patch is attached.

Sven
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