ENH: Make it easier to modify number of classes.
COMP: Remove unused variables

There were several variables that were unused that were removed,
and in also variables that could have more narrow scope were placed
such that they are not always computed.  Finally, it is much better
to use const references when possible so that unnecessary copying
is not done.
Merge pull request #49 from BRAINSia/RemoveCompWarnings

COMP: Remove unused variables
ENH:  Improving desing.
Merge branch 'master' of https://github.com/stnava/ANTs
BUG: extra HROM in ImageMath; WIP: prior in DiReCT
ENH: Adding specification of knot spacing on the command line.
BUG:  Fixing logic.
Merge pull request #50 from stnava/KnotSpacingCommandLine

Knot spacing command line
DOC:  Adding information about B-spline transforms to command line help menu.
BUG: initialization of sccan
Merge branch 'master' of github.com:stnava/ANTs
...
BUG: init needs sparsifyother
BUG: init needs sparsifyother
WIP: sparsify at end of conjgrad
BUG: 0 => 1.e-9
WIP: more prior-based work
ENH: Updating B-spline SyN parameters.
ENH: Updating B-spline SyN parameters.
ENH: Permitting specification of both sets SyN parameters.