removed various dtors that do nothing and violate the rule of three

Change-Id: If8c4a0531284f99ad5430573ed431ba312355d56
Merge topic 'more-rule-of-three' into master

915de18e removed various dtors that do nothing and violate the rule of three
Link the pvtk binary to MPI libraries

Needed after recent changes to make MPI links private.

Change-Id: I997943dd0c42a2cdc0e4d6e5415d335d3eb28728
Merge topic 'private-depends' into master

b154f1af Link the pvtk binary to MPI libraries