Handle double transform in sasindexkey

	* src/sasindexkey.h (SASIndexKeyInitDouble): Correct transform
	to internal binary.
	(SASIndexKeyReturn1stDouble) Correct transform from internal
	binary.
	* src/tests/sasindex_t.c (sassim_index_test5): New Test.
	(sassim_index_test4): Use float values for keys.
	(main): Call sassim_index_test5.

Signed-off-by: Steven Munroe  <sjmunroe@us.ibm.com>