Properties are displayed in a table

All new calculated values are stored in a table.
Only adding new values is currently supported.
added notes file
corrected typo
Added script for building on windows

Only works if you put H2Oprops*.py and iapws.py in
a separate folder and then run cxfreeze_setup.py from there.
Created function for converting cold id to prop. value
added copy to MIME support
ignore backupfiles
fixed temperature bug
Changed column names and added tooltips
added clear and remove buttons