slight cosmetic change to the fix from paulxia
slight cosmetic change to the fix from paulxia

Change the code in the fix from paulxia to look
like the update to delta_lamba a few lines lower.

Also force the compiler to use math with doubles.

Signed-off-by: Ferry Huberts <1f083df4a0371a8eba2ce71fc6b0e214b2551710@mindef.nl>

AHR-Project/nmealib,AHR-Project/nmealib