Merge pull request #1599 from rbberger/collected-small-changes

Collected small changes

src/USER-PHONON/Install.sh

@@ -42,5 +42,3 @@ action fix_phonon.cpp fft3d_wrap.h
 action fix_phonon.h fft3d_wrap.h
 action dynamical_matrix.cpp
 action dynamical_matrix.h
-action third_order.cpp
-action third_order.h

src/USER-PTM/ptm_initialize_data.h

@@ -15,6 +15,7 @@ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLI
 #include "ptm_deformation_gradient.h"
 #include "ptm_fundamental_mappings.h"
 #include "ptm_alt_templates.h"
+#include <cstddef>
 
 
 namespace ptm {