Explicit solvent constant pH MD
 &cntrl
   imin=0, irest=1, ntx=5,
   ntpr=1000, ntwx=1000, nstlim= 50000,
   dt=0.002, ntt=3, tempi=300,
   temp0=300, gamma_ln=5.0, ig=-1,
   ntc=2, ntf=2, cut=8, iwrap=1,
   ioutfm=1, icnstph=2, ntcnstph=100,
   solvph= 6.4, ntrelax=100, saltcon=0.1,
 /
