Review request: Masks support compositeOps and opacity

[Dmitry Kazakov]

Hi, all!

Sorry for not using reviewboard, it doesn't accept git patches and svn
creates quite messy patches when a file is moved to a different location =)

Well, here is a patch that allows masks to use different compositeOps and
opacity. Now a user can choose how a mask will be applied to the layer. It
makes sense in some circumstances. You can test it with a test file in
attachment.

Tetscase:
1) If you set mask's composition to "normal", then a selection will be
darker than a background.
2) If you set it to "Alpha darken", then it will dissolve in a background.

To achieve this i moved colorspace, composition and opacity stuff from
KisLayer to KisBaseNode, therefore masks can use it too.

Have i forgotten to move something connected to colorspaces alongside?

Waiting for your critique! =)


-- 
Dmitry Kazakov
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