OPS: add some statistical functions
OPS StatCalculator - fix overflow bugs
OPS: major refactor of the statistics functions

Now the stat functions use much less memory and there is less code
duplication.
OPS: document StatCalculator
Removed SequentializeView.
It was broken because it had to assumed that the source interval has min=0.
SequentializeRandomAccess was basically a duplicate of TransformRandomAccess.
To avoid confusion (and because it was un-used) I simply removed SequentializeView.
If needed the same behaviour is easily achieved using TransformView with a SequentializeTransform.
added javadoc
OPS: rename the statistical functions

Now delineating differences by Population vs. Sample rather than
Biased vs. Unbiased. This is more user friendly and less technical.
Merge branch 'ops-stats'

Extends the support of statistical functions within OPS
Added new adapters to ops
Added Examples to ops
Merge branch 'master' of https://github.com/imagej/imglib
OPS: rename methods in StatCalculator

This is a continuation of rename changes in the statistical functions
Views: fix bug in bck() (was calling fwd())
OPS: remove some broken functions
OPS: make NullNumericFunction return NaN values
OPS: RoiPointSet - change definition of bounds

Make sure that all Roi points are contained in bounds. Iteration
still is limited to points wholly contained in Roi.
OPS: update RealConvolutionFunction

There have been API changes over time that simplify the
implementation considerably.
OPS: document some of the Function classes
OPS: document some functions

While at it fix a few usage bugs
OPS: improve documentation of ConverterFunction