Merged in Tangent Normal Brush Engine

[Wolthera]

Hey everyone,

I merged my GSoC branch in. I didn't want to give you guys a huge ass mail
with my whole changelog, so I am writing this seperately.

Commit is here:
http://quickgit.kde.org/?p=calligra.git&a=commit&h=402f1ab9a06c5499c66a694036c5ad983cd4365d

This implements a Tangent Normal Brush Engine, which allows you to draw
normal maps, which in turn can be used by 3d renderers.

It also implemented a tilt-cursor, a normalize filter, modified the
phongbumpmap filter to accept normalmaps, and fixed one single bug(BUG
338011 <http://bugs.kde.org/show_bug.cgi?id=338011>).

Manual is to be found here:
https://userbase.kde.org/Krita/Manual/BrushEngines/TangentNormalBrush
Demonstration is here: https://www.youtube.com/watch?v=qiX60EWyMF8

If I messed up, please don't hesitate to get back to me.

Regardless, have fun with experimenting!

-- 
Wolthera
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