make name of the actual executable (i.e. arg[0]) accessible

src/lammps.h

@@ -46,6 +46,7 @@ class LAMMPS {
 
   char *suffix,*suffix2;         // suffixes to add to input script style names
   int suffix_enable;             // 1 if suffixes are enabled, 0 if disabled
+  char *exename;                 // pointer to argv[0]
   char ***packargs;              // arguments for cmdline package commands
   int num_package;               // number of cmdline package commands
   int cite_enable;               // 1 if generating log.cite, 0 if disabled