Canvas rotation preliminary patch

[Dmitry Kazakov]

Hi, All!

The reviewboard seems to be down right now, so i'm sending the patch here.
http://dimula73.narod.ru/coordinates_refactor_v6.patch

What is implemented:
o Mirroring Ctrl+I
o Rotation Ctrl+[, Ctrl+]
o Reset canvas Ctrl+'

Known bugs:
1) I still do not change the scroll area of KoCanvasController, so the
canvas picture may be cropped when rotated
2) There is a strange bug:
    1. Switch to openGL canvas
    2. Switch back QPainter canvas
    3. Open configuration dialog, do not change anything, press ok
    4. Try to zoom: KisPrescaledProjection in NOT updated

I don't know what is the reason of this bug yet, but it's really difficult
to reproduce ;)


-- 
Dmitry Kazakov
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