Git commits in Moodle 2.4.1 by Matt Petro

commit 95ae9d9e5e16b5bcb42c91d963b572b8dece0bcf
Author: Matt Petro <petro@engr.wisc.edu>
Date:   Fri, 02 Nov 2012 23:07:02 +0800
Tag:    v2.4.1

MDL-36025 qtype calculated: Fix handling of "-0"