Adding threshold parameters for aggregation and Dirichlet boundary conditions.
MueLu: warn when  aggregation stagnates

When doing no repartitioning, or trying to construct hierarchy for a
diagonal matrix with isolated nodes going into aggregates, the
coarsening ratio can get close to 1. In this case, no real progress is
made, and it is much more preferrable to stop.

It is not an ideal solution, though. It may be better to stop a level or
two earlier, but currently there is no mechanism in the Hierarchy to
roll back levels.
MueLu: added some decorations to warnings

to make them more visible
Add counters to track and log different types of mesh modification.

Protected by a macro, turned off by default.
This is work in progress.

(From Sierra)
STK_UTIL: Avoid space between ( and number in timer output so test util can parse correctly. Also gives more precision for values 0 < val < 10

(From Sierra)
Fix a couple of build warnings.

(From Sierra)
Make BulkData destructor virtual to quiet a build warning.

(From Sierra)

Build/Test Cases Summary
Enabled Packages: STKMesh, STKUtil
Disabled Packages: PyTrilinos,SEACASExo2mat,SEACASMat2exo,Optika,STKClassic
Enabled all Forward Packages
0) MPI_DEBUG => Skipped configure, build, test due to no enabled packages! => Does not affect push readiness! (-1.00 min)
1) SERIAL_RELEASE => Skipped configure, build, test due to no enabled packages! => Does not affect push readiness! (-1.00 min)
2) MPI_DEBUG_SS => passed: passed=9,notpassed=0 (11.51 min)
3) SERIAL_RELEASE_SS => passed: passed=7,notpassed=0 (13.44 min)
Other local commits for this build/test group: c6138be, 9462b79, ff02f4b
Tpetra: Adding an option for Grey
minor change to ml_smoother.c to ensure that memory is allocated even for
empty processors. Added the capability of using ML's block GS smoother
instead of ifpack's. It is an option that is currently turned off,
but might be useful to play with in comparing efficiencies of the
two approaches.
Refactor trilinoscouplings/examples/fenl for clean separation of setup and solve phases.