. Centralized the functions sunrise/sunset to php_sunrise_sunset
to lessen duplicate code.
. Made wrapper function php_do_date_sunrise_sunset() to lessen
duplicate code.
. Coding style fixes.
. renamed sunfuncs.h -> php_sunfuncs.h
@ new date_sunrise() function.
@ new date_sunset() function.
#since i have no premission updating the win32 project file, i'm sending patch on the list.