Deprecate/Remove one of HyperSphere or HyperSphereNeighborhood

[hanslovsky]

HyperSphere and HyperSphereNeighborhood do the same thing. Having both in imglib2-algorithm is confusing for the caller. I suggest to remove HyperSphere once #67 is fixed because HyperSphereNeighborhood implements Neighborhood as a common interface with other similar classes (HyperSphere is the lone class in its package).

[acardona]

To further add: HyperSphereNeighborhood is missing documentation, in addition to having bug #67. The deprecation of HyperSphere seems premature.

[hanslovsky]

That's why I suggested to remove it

once #67 is fixed