Na+ is represented by opls_405 instead of opls_407

The following warnings occur after OPLSaa.db is included in forcefield.itp. 
The OPLSaa.db parameters have been used to replace those of oplsaa.ff.
There is a conflict with protein parameters for carbonyl bonds (WARNING 2)
and for ammonium angles (WARNINGS 4 and 5).

WARNING 1 [file OPLSaa.db, line 55]: Overriding Bond parameters.
  old: 0.1449 282002 0.1449 282002
  new: N    CT   1  1.471E-01  3.071056E+05
WARNING 2 [file OPLSaa.db, line 76]: Overriding Bond parameters.
  old: 0.1229 476976 0.1229 476976
  new: C     O   1  1.250E-01  5.489408E+05
WARNING 3 [file OPLSaa.db, line 84]: Overriding Angle parameters.
  old: 112.7 488.273 112.7 488.273
  new: CT   CT   CT    1  1.1270E+02  4.882728E+02
WARNING 4 [file OPLSaa.db, line 153]: Overriding Angle parameters.
  old: 109.5 292.88 109.5 292.88
  new: H3   N3   H3    1  1.2160E+02  5.857600E+02
WARNING 5 [file OPLSaa.db, line 154]: Overriding Angle parameters.
  old: 109.5 292.88 109.5 292.88
  new: H3   N3   CT    1  1.1840E+02  3.179840E+02
WARNING 6 [file OPLSaa.db, line 160]: Overriding Angle parameters.
  old: 111.2 669.44 111.2 669.44 
  new: C    CT   N3    1  1.1010E+02  5.271840E+02
WARNING 7 [file OPLSaa.db, line 210]: Overriding Ryckaert-Bell. parameters.
  old: 0.80333 2.40999 0 -3.21331 0 0 0.80333 2.40999 0 -3.21331 0 0 
  new: N3  CT  CT  HC  3    0.80333   2.40998   0.0      -3.21331   0.0       0.0
WARNING 8 [file OPLSaa.db, line 244]: Overriding Ryckaert-Bell. parameters.
  old: -1.26775 3.02085 1.74473 -3.49782 0 0 -1.26775 3.02085 1.74473 -3.49782 0 0 
  new: H3  N3  CT  CT   3   0.00000   0.00000   0.00000   0.00000   0.00000   0.00000
WARNING 9 [file OPLSaa.db, line 245]: Overriding Ryckaert-Bell. parameters.
  old: 0.72592 2.17777 0 -2.9037 0 0 0.72592 2.17777 0 -2.9037 0 0
  new: H3  N3  CT   C   3   0.00000   0.00000   0.00000   0.00000   0.00000   0.00000
WARNING 10 [file OPLSaa.db, line 246]: Overriding Ryckaert-Bell. parameters.
  old: 0.54601 1.63803 0 -2.18405 0 0 0.54601 1.63803 0 -2.18405 0 0
  new: H3  N3  CT  HC   3   0.00000   0.00000   0.00000   0.00000   0.00000   0.00000
WARNING 11 [file OPLSaa.db, line 286]: Overriding Ryckaert-Bell. parameters.
  old: -1.8828 1.8828 0 0 0 0 -1.8828 1.8828 0 0 0 0
  new: CM  CT  OH  HO  3   -0.44350   3.83255   0.72801  -4.11705   0.00000   0.00000
WARNING 12 [file OPLSaa.db, line 287]: Overriding Ryckaert-Bell. parameters.
  old: -0.4435 3.83255 0.72801 -4.11705 0 0 -0.4435 3.83255 0.72801 -4.11705 0 0
  new: CT  CT  OH  HO  3    0.41840   1.25520   0.00000  -1.67360   0.00000   0.00000
WARNING 13 [file OPLSaa.db, line 293]: Overriding Ryckaert-Bell. parameters.
  old: -4.707 2.92044 1.78656 0 0 0 -4.707 2.92044 1.78656 0 0 0
  new: C   N   CT  CT  3   15.70255  31.75656  -3.66936 -43.78975   0.00000   0.00000
WARNING 14 [file OPLSaa.db, line 294]: Overriding Ryckaert-Bell. parameters.
  old: -0.29079 -0.87237 0 1.16315 0 0 -0.29079 -0.87237 0 1.16315 0 0
  new: C   N   CT  HC  3    0.00000   0.00000   0.00000   0.00000   0.00000   0.00000

