Loosen some of the test permitted errors (so glibc can cope).

Added more diagnostic code to aid diagnosis of errors.
Allow (0,0) as a valid result if the expected result is very small.


[SVN r31588]

libs/math

@@ -1 +1 @@
-Subproject commit fc99ec6f69775d105f056b933c59a8aa6881ba68
+Subproject commit 1df348c201bbcd69fb0288a05f24990e08c0a184