Minor improvement to vtkProbeFilter in dealing with tolerance.

vtkProbeFilter uses the bounds of the whole dataset in choosing the
tolerance for FindCell(). This is problematic for large datasets
where the bounds are significantly larger than individual cells.
I added an extra check that happens after finding the closest cell.
This check rejects the cell if the point is outside it by a distance
of 1/10 the size of the cell.

Change-Id: I86807d19fa313e576a1d51fbf34623099800dd3c
Merge topic 'probe-fix' into master

27746b47 Minor improvement to vtkProbeFilter in dealing with tolerance.