Fix -Wunused-variable in GroupwiseRegistration.cpp

/tmp/GROUPS/Modules/CLI/Groups/GroupwiseRegistration.cpp: In member function ‘void GroupwiseRegistration::initProperties(int, const char**, int)’:
/tmp/GROUPS/Modules/CLI/Groups/GroupwiseRegistration.cpp:572:6: warning: unused variable ‘nFace’ [-Wunused-variable]
  int nFace = m_spharm[subj].sphere->nFace();
      ^
/tmp/GROUPS/Modules/CLI/Groups/GroupwiseRegistration.cpp: In member function ‘void GroupwiseRegistration::updateDeformation(int)’:
/tmp/GROUPS/Modules/CLI/Groups/GroupwiseRegistration.cpp:953:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i < m_spharm[subject].vertex.size() && !updated; i++)
                    ^
/tmp/GROUPS/Modules/CLI/Groups/GroupwiseRegistration.cpp:957:16: warning: unused variable ‘v0’ [-Wunused-variable]
   const float *v0 = v->fv();
                ^
/tmp/GROUPS/Modules/CLI/Groups/GroupwiseRegistration.cpp: In member function ‘void GroupwiseRegistration::updateLandmark()’:
/tmp/GROUPS/Modules/CLI/Groups/GroupwiseRegistration.cpp:977:8: warning: unused variable ‘id’ [-Wunused-variable]
    int id = m_spharm[subj].landmark[i]->id;
        ^
/tmp/GROUPS/Modules/CLI/Groups/GroupwiseRegistration.cpp: In member function ‘void GroupwiseRegistration::updateLandmarkMedian()’:
/tmp/GROUPS/Modules/CLI/Groups/GroupwiseRegistration.cpp:1019:8: warning: unused variable ‘id’ [-Wunused-variable]
    int id = m_spharm[subj].landmark[i]->id;
        ^
/tmp/GROUPS/Modules/CLI/Groups/GroupwiseRegistration.cpp: At global scope:
/tmp/GROUPS/Modules/CLI/Groups/GroupwiseRegistration.cpp:1165:42: warning: unused parameter ‘coeff’ [-Wunused-parameter]
 float GroupwiseRegistration::cost(float *coeff, int statusStep)
                                          ^
/tmp/GROUPS/Modules/CLI/Groups/GroupwiseRegistration.cpp: In member function ‘void GroupwiseRegistration::optimization()’:
/tmp/GROUPS/Modules/CLI/Groups/GroupwiseRegistration.cpp:1229:6: warning: unused variable ‘n2’ [-Wunused-variable]
  int n2 = m_csize * 2 - n1;
      ^
NIRALUser / GROUPS

Fix -Wunused-variable in GroupwiseRegistration.cpp #15
