static variable defined in header file

[yoonbo]

In the devel branch, lines 112--117 of include/cpp_dslash_parscalar.h file are defining the static variables as

     ShiftTable<Dslash<float>::HalfSpinor>* Dslash<float>::s_tab = nullptr;
     DslashTables<Dslash<float>::HalfSpinor, 4>* Dslash<float>::tab = nullptr;

     ShiftTable<Dslash<double>::HalfSpinor>* Dslash<double>::s_tab = nullptr;
     DslashTables<Dslash<double>::HalfSpinor, 4>* Dslash<double>::tab = nullptr;

Since they are defined in a header file, they are defined everywhere the cpp_dslash_parscalar.h is included, and it yields errors something like

../../other_libs/cpp_wilson_dslash/lib/libdslash.a(cpp_dslash_parscalar_32bit.o):(.bss+0x18): multiple definition of `CPlusPlusWilsonDslash::Dslash<double>::tab'
hmc.o:(.bss+0x28): first defined here

when linking the Chroma feature/mg_proto branch. They need to be moved to one of the .cc codes, and the updated commit needs to be linked to the Chroma feature/mg_proto branch submodule.