Release of version 3.3.9 for all PHREEQC programs

[dlparkhurst]

PHREEQC: Updated sit.dat to version 9b0 from www.thermochimie-tdb.com. Corrected description of parameters for some RATES definitions in Amm.dat. PHREEQC crashed if the proportion of sites to kinetic reactant was zero when a surface was related to a kinetic reaction.

PhreeqcRM: Fixed a convergence problem in PhreeqcRM due to a poor initial guess for the mass of water in a cell; now uses the current moles of oxygen to estimate the mass of water.

PHAST. Minor code change to eliminate compiler warnings.