add rmass_flag and rectify comments and indents

void FixAdapt::post_constructor()

{

  // Create local Fix Store even when ressetflag == false, to be able to use `scale` keyword for charge and diameter

  if (!diamflag && !chgflag) return;

  // new id = fix-ID + FIX_STORE_ATTRIBUTE

  newarg[4] = (char *) "1";

  newarg[5] = (char *) "1";

  if (diamflag && atom->radius_flag) {// Previously unsafe! The radius_flag was not checked, could run an atom_style w/o radius attribute and get here without a previous check / error !

  if (diamflag && atom->radius_flag) {

    int n = strlen(id) + strlen("_FIX_STORE_DIAM") + 1;

    id_fix_diam = new char[n];

    strcpy(id_fix_diam,id);

    }

  }

  if (chgflag && atom->q_flag) {// Previously unsafe! The q_flag was not checked, could run an atom_style w/o charge attribute and get here without a previous check / error !

  if (chgflag && atom->q_flag) {

    int n = strlen(id) + strlen("_FIX_STORE_CHG") + 1;

    id_fix_chg = new char[n];

    strcpy(id_fix_chg,id);

      if (ad->aparam == DIAMETER) {

        if (!atom->radius_flag)

          error->all(FLERR,"Fix adapt requires atom attribute diameter");

        if (!atom->rmass_flag)

          error->all(FLERR,"Fix adapt requires atom attribute mass");

        if (discflag && domain->dimension!=2)

          error->all(FLERR,"Fix adapt requires 2d simulation");

      }

  }

  // fixes that store initial per-atom values

  /* Unnecessary ? `fix_diam` and `fix_chg` seem to be already defined in FixAdapt::post_constructor(), commenting them out does not crash my MWE

  if (id_fix_diam) {

    int ifix = modify->find_fix(id_fix_diam);

    if (ifix < 0) error->all(FLERR,"Could not find fix adapt storage fix ID");

    int ifix = modify->find_fix(id_fix_chg);

    if (ifix < 0) error->all(FLERR,"Could not find fix adapt storage fix ID");

    fix_chg = (FixStore *) modify->fix[ifix];

  }*/

  }

  if (strstr(update->integrate_style,"respa"))

    nlevels_respa = ((Respa *) update->integrate)->nlevels;

      // also scale rmass to new value

      if (ad->aparam == DIAMETER) {

				/* `mflag` unnecessary ? the test `if(!atom->radius_flag)` in `FixAdapt::init()` should perevent `atom->rmass_flag == false`. Unless there can be combinations of atom styles with `radius` but without `rmass`

				It could also be unsafe since rmass_flag could be added using `fix property/atom` even for an atom_style that does not have radius attribute, although that possibility should be avoided as well with the test `if(!atom->radius_flag)` in `FixAdapt::init()`  */

        double density;

        double *vec = fix_diam->vstore; // Get initial radius to use `scale` keyword

        // Get initial diameter if `scale` keyword is used

        double *vec = fix_diam->vstore;

        double *radius = atom->radius;

        double *rmass = atom->rmass;

        int *mask = atom->mask;

          }

      } else if (ad->aparam == CHARGE) {

        double *vec = fix_chg->vstore; // Get initial charge to use `scale` keyword

        // Get initial charge if `scale` keyword is used

        double *vec = fix_chg->vstore;

        double *q = atom->q;

        int *mask = atom->mask;

        int nlocal = atom->nlocal;