Transform folder dom/ from C to C++.

dom/Makefile.am

dom/lgm/Makefile.am

dom/lgm/ansys2lgm.cc

dom/lgm/lgm_accel.cc

dom/lgm/lgm_domain.cc

dom/lgm/lgm_domain2d.cc

dom/lgm/lgm_domain3d.cc

dom/lgm/lgm_load.cc

dom/lgm/lgm_parallel.cc

dom/lgm/lgm_transfer.h

dom/lgm/lgm_transfer2d.cc

dom/lgm/lgm_transfer3d.cc

dom/lgm/ngin/.gitignore

dom/lgm/ngin/Makefile.am

dom/lgm/ngin/ng.cc

dom/lgm/ngin/ngin-lex.hh

dom/lgm/ngin/ngin-lex.ll

dom/lgm/ngin/ngin-yacc.yy

dom/lgm/ngin2d/.gitignore

dom/lgm/ngin2d/Makefile.am