Improved use of sun.h
Fixes for Windows
Latest updates and bug fixesx from Wendelin
Inserted math definition macro
Bug fixes and new -E and -i options (from Wendelin Sprenger and Jan Wienold)
Added -O1 option to output total solar radiance
Added #define _USE_MATH_DEFINES
Replaced gendaylit with new version by Wendelin Sprenger and Jan Wienold
Forgot to include rtmath.h
Windows compatibility changes from Bill Hoffman
Minor fixes
Minor bug fix
Minor bug fixes
Eliminated debug message
Added missing library data files used by gendaylit
Added Jean-Jacques Delaunay's gendaylit program to distribution
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