The main SUNTANS input file is called suntans.dat and contains three
columns. The first column contains the name of the variable used in
the program while the second column contains its value, and the information
after that value is ignored. Lines beginning
with # are ignored, while empty lines will cause the program to
crash. The SUNTANS executable looks for this file in the directory specified
by --datadir=. If this is not specified, then it looks for it in the
same directory as the sun executable.
or 
: Boolean
