Updated genbox to handle when mbox(in SIZE) is equal to the number of boxes in the .box file, including one.

git-svn-id: https://svn.mcs.anl.gov/repos/nek5/trunk/tools@996 24248562-e74d-0410-ab4b-d4d80c744c73
fix zmin/zmax check

git-svn-id: https://svn.mcs.anl.gov/repos/nek5/trunk/tools@1000 24248562-e74d-0410-ab4b-d4d80c744c73
tight locglob tolerance

git-svn-id: https://svn.mcs.anl.gov/repos/nek5/trunk/tools@1001 24248562-e74d-0410-ab4b-d4d80c744c73
Added checks to genbox for BC and xyz ranges

git-svn-id: https://svn.mcs.anl.gov/repos/nek5/trunk/tools@1002 24248562-e74d-0410-ab4b-d4d80c744c73