add missing header files to USER-INTEL package

src/Purge.list

src/USER-INTEL/angle_charmm_intel.cpp

src/USER-INTEL/angle_harmonic_intel.cpp

src/USER-INTEL/bond_fene_intel.cpp

src/USER-INTEL/bond_harmonic_intel.cpp

src/USER-INTEL/dihedral_charmm_intel.cpp

src/USER-INTEL/dihedral_fourier_intel.cpp

src/USER-INTEL/dihedral_harmonic_intel.cpp

src/USER-INTEL/dihedral_opls_intel.cpp

src/USER-INTEL/fix_intel.cpp

src/USER-INTEL/nbin_intel.cpp

src/USER-INTEL/npair_full_bin_ghost_intel.cpp

src/USER-INTEL/npair_full_bin_intel.cpp

src/USER-INTEL/npair_half_bin_newton_intel.cpp

src/USER-INTEL/npair_half_bin_newton_tri_intel.cpp

src/USER-INTEL/npair_intel.cpp

src/USER-INTEL/pair_eam_intel.cpp

src/USER-INTEL/pppm_disp_intel.cpp

src/USER-INTEL/pppm_intel.cpp