BUG: Fix the number of build warnings & errors reported on the dashboard when multiple Build.xml files are submitted for a single row.  Previously, this number only reflected the numbers in the last file (not the total tally across all files)

git-svn-id: https://www.kitware.com/svn/CDash/trunk@3364 91079597-3006-4846-9bd3-4f3fb3d139a7