BUG: Fix Cppcheck build with ninja.

Cppcheck only builds with make.
ENH: SegmentTubeSeeds logic fixed.
Merge pull request #316 from thewtex/cppcheck-ninja

BUG: Fix Cppcheck build with ninja.
Merge pull request #317 from aylward/ComputeSegmentTubeParams

ENH: SegmentTubeSeeds logic fixed.