#2391/#1283 Nasty bug in calculating vertex mesh areas/volumes which was hidden in ternary conditional operators.

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@21023 b5f69653-2bf5-0310-8201-b0dafb8e1405
#2449 Fix r21011 on Intel by introducing a new MathsCustomFunction which does rounded-up divisions of H5 unsigned ints.  Also fix coverage.

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@21024 b5f69653-2bf5-0310-8201-b0dafb8e1405
Fix Windows for Joe (r21023/#2391/#1283).

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@21025 b5f69653-2bf5-0310-8201-b0dafb8e1405
git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@21026 b5f69653-2bf5-0310-8201-b0dafb8e1405
#2477/#2300 Oops.

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@21027 b5f69653-2bf5-0310-8201-b0dafb8e1405
#2391 Alternative method for face normal/area

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@21030 b5f69653-2bf5-0310-8201-b0dafb8e1405
#2391 "Coverage" of alternative method for face normal/area which is independent of FPEs 

git-svn-id: https://chaste.cs.ox.ac.uk/svn/chaste/trunk@21031 b5f69653-2bf5-0310-8201-b0dafb8e1405