Move procComm and procExe to main Process structure

Process.c

@@ -515,6 +515,8 @@ void Process_display(const Object* cast, RichString* out) {
 void Process_done(Process* this) {
    assert (this != NULL);
    free(this->cmdline);
+   free(this->procComm);
+   free(this->procExe);
    free(this->tty_name);
 }