Fixed compiler warning about rule of three violation

Added explicit copy assignment operator to BlockSetInfoType.
While at it, eliminated a couple of uses of the copy assignment
operator where .clear() could be used instead.

Change-Id: I8426d184c21f1cc938bf2c5856557c0b2f8ebc50
Fixed compile warning in the SMP class.

Change-Id: I32be8e54c7c84656552d4e093d44396ad683a741
Merge topic 'fixed-smp-warning' into master

7d2e8f03 Fixed compile warning in the SMP class.
Merge topic 'rule-of-3-exodus' into master

a76e204c Fixed compiler warning about rule of three violation
ENH: Update vtkDelaunay2D to support DesiredOutputPrecision

This updates vtkDelaunay2D to support a choice of desired precision
(default, single, or double) for output points. It uses the analogous
code in vtkThreshold as a model.

Change-Id: Ib5d9149f5bb34fc4be0b5005b0e94e38fcf5b52b