Restore workaround for compiler bug in pair_snap.h

  virtual double init_one(int, int);

  virtual double memory_usage();

  double rcutfac, quadraticflag; // declared public to workaround gcc 4.9

  int ncoeff;                    //  compiler bug, manifest in KOKKOS package

protected:

  int ncoeff, ncoeffq, ncoeffall;

  int ncoeffq, ncoeffall;

  double **bvec, ***dbvec;

  class SNA** sna;

  int nmax;

  double *wjelem;               // elements weights

  double **coeffelem;           // element bispectrum coefficients

  int *map;                     // mapping from atom types to elements

  int twojmax, diagonalstyle, switchflag, bzeroflag, quadraticflag;

  double rcutfac, rfac0, rmin0, wj1, wj2;

  int twojmax, diagonalstyle, switchflag, bzeroflag;

  double rfac0, rmin0, wj1, wj2;

  int rcutfacflag, twojmaxflag; // flags for required parameters

};