Patch that speed things up (brain dump)

[Roger Larsson]

This patch speeds things up enough for most brushes (even the paprika).

It is really a multi part...
1) An attempt to speed up drawing itself (not finished, has bugs)
	Guess why I started to look into other image libraries :-)
2) Rethink of m_dirtyRect and screen redraws
	let m_dirtyRect accumulate changes!
	notify on:
	a) mouse release
	b) timeout  (kis_notify_limit [ms])
		The timeout is global to simplify modifications.
		kis_notify_limit = 0 gives you back the current behaviour.
		kis_notify_limit = 10 gives about one update per monitor refresh (100Hz).
		kis_notify_limit = 50 X is no longer the problem - krita/brushes are.

/RogerL

-- 
Roger Larsson
Skellefteå
Sweden
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