fixed visibility of min and max in AbstractXYProjector
moved volatile types and projectors to imglib2-core net.imglib2.display
where they make most sense currently

added boolean return value to interactive viewers and renderers that
signalizes the success of painting
fixed examples
fixed painter thread logic, volatile openconnectome sets valid property
correctly after fetching and makes it available for randomaccess
use weak references first
load local example
Merge branch 'master' into volatile

Conflicts:
	imglib2/examples/src/main/java/interactive/remote/catmaid/CATMAIDRandomAccessibleInterval.java
NLinearInterpolator is faster than NLinearInterpolator3D so take it instead
ARGB linear interpolator and experiments with multi-scale openconnecto.me
removed obsolete and insufficient util.RealSum from examples as ImgLib2
contains the stabilizing version in net.imglib2.util
added NLinearInterpolatorARGB and factory that internally uses doubles to
accumulate channels and later clips the result to [0--255]
experiments with multi-scale openconnectome backend
added TranslationGet transform interface
removed obsolete and insufficient util.RealSum from examples as ImgLib2
contains the stabilizing version in net.imglib2.util
Fix faulty initialization of AffineRandomAccessible.AffineRandomAccess
added method for bounding box estimation to affinetransform3d
TODO: that may go somewhere else or become an interface (Boundable
and InvertibleBoundable) such as in mpicbg
Merge branch 'master' into volatile

Conflicts:
	examples/src/main/java/interactive/InteractiveCATMAIDRotationExample.java
	examples/src/main/java/interactive/catmaid/CATMAIDRandomAccessibleInterval.java
	examples/src/main/java/interactive/remote/Volatile.java
	examples/src/main/java/interactive/remote/VolatileNumericType.java
	examples/src/main/java/interactive/remote/VolatileRealType.java
	examples/src/main/java/interactive/remote/VolatileRealTypeARGBConverter.java
	imglib2/core/src/main/java/net/imglib2/display/VolatileRealType.java
	imglib2/core/src/main/java/net/imglib2/interpolation/randomaccess/NLinearInterpolatorARGBFactory.java
	imglib2/examples/src/main/java/interactive/catmaid/CATMAIDRandomAccessibleInterval.java
	imglib2/examples/src/main/java/interactive/remote/VolatileRealType.java
	imglib2/examples/src/main/java/interactive/remote/catmaid/CATMAIDRandomAccessibleInterval.java
	ui/src/main/java/net/imglib2/ui/AbstractInteractiveViewer2D.java
	ui/src/main/java/net/imglib2/ui/TransformEventHandler3D.java
	ui/src/main/java/net/imglib2/ui/ij/GUI.java
	ui/src/main/java/net/imglib2/ui/ij/ImagePlusInteractiveDisplay3D.java
	ui/src/main/java/net/imglib2/ui/swing/SwingInteractiveDisplay2D.java
	ui/src/main/java/net/imglib2/ui/swing/SwingInteractiveDisplay3D.java
Added n-dimensional scaling real-transformation
added translationget interface
added a simple volume renderer example (transparency z-projection)