Improve efficiency of the tetrahedral mesh cover

Jianfeng Yanrequested to merge
_transfer-jianfengyan/iMSTK:perf into master

Fixed CHECK of pointers; fixed spelling error; createTetrahedralMeshCover: improved coverage of surface triangles when create a tet mesh; efficiency improved by 5x~50x depending on mesh size

Edited by Jianfeng Yan

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