provide Command base class in command.h for deriving command styles from

src/read_data.cpp

@@ -11,10 +11,6 @@
    See the README file in the top-level LAMMPS directory.
 ------------------------------------------------------------------------- */
 
-// lmptype.h must be first b/c this file uses MAXBIGINT and includes mpi.h
-// due to OpenMPI bug which sets INT64_MAX via its mpi.h
-//   before lmptype.h can set flags to insure it is done correctly
-
 #include "read_data.h"
 
 #include "angle.h"
@@ -66,7 +62,7 @@ const char *suffixes[] = {"/cuda","/gpu","/opt","/omp","/kk",
 
 /* ---------------------------------------------------------------------- */
 
-ReadData::ReadData(LAMMPS *lmp) : Pointers(lmp)
+ReadData::ReadData(LAMMPS *lmp) : Command(lmp)
 {
   MPI_Comm_rank(world,&me);
   line = new char[MAXLINE];