Get test-numeric working.

[Derek Atkins]

Log Message:
-----------
Get test-numeric working.

	* src/engine/test/test-numeric.c:
	  Make sure we use gint64 instead of gint when trying to test
	  values > 2^32.

Modified Files:
--------------
    gnucash:
        ChangeLog
    gnucash/src/engine/test:
        Makefile.am
        test-numeric.c