tpt++/jacksonmj: Change melting point for snow with wrong ctype back to 273.15 9e7ead9bccc7
tpt++/jacksonmj: FRZZ and FRZW changes/fixes 66a530f5a3ec
tpt++: fixes to FUSE (changed in 27e3e12), and IRON (changed in 0d70547) 43bab359db20

Also use sim functions in those files instead of globals
tpt++/jacksonmj: Flatter surface when liquids solidify 829e2cca7df8