CommunicationPlan copy

[streeve]

First, adding a test which fails in copying the CommunicationPlan due to duplicating communicators. Add missing copy constructor/assignment operator.

Found during periodic communication #263 with @sslattery

Increased coverage by explicitly setting MPI_EXEC_NUMPROCS=2 for travis (previously running everything one one rank)

[codecov]

Codecov Report

Merging #295 into master will increase coverage by 1.8%.
The diff coverage is 100.0%.

@@           Coverage Diff            @@
##           master    #295     +/-   ##
========================================
+ Coverage    93.4%   95.2%   +1.8%     
========================================
  Files          50      50             
  Lines        2944    2952      +8     
========================================
+ Hits         2750    2811     +61     
+ Misses        194     141     -53     

Flag	Coverage Δ
#clang	95.2% <100.0%> (+1.8%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
core/src/Cabana_CommunicationPlan.hpp	98.6% <100.0%> (+8.3%)	⬆️
cajita/src/Cajita_Halo.hpp	98.1% <0.0%> (+0.9%)	⬆️
cajita/src/Cajita_GlobalGrid.cpp	100.0% <0.0%> (+6.5%)	⬆️
core/src/Cabana_Distributor.hpp	95.5% <0.0%> (+18.3%)	⬆️

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[streeve]

Updated to match arborx/ArborX#369

[streeve]

It looks like the codecov patch is failing because we're only running with one MPI rank on travis (and therefore not testing a reasonable fraction of the CommPlan). @junghans is there an easy way to get this to run on at least 2 MPI ranks?

[junghans]

Try to set MPIEXEC_MAX_NUMPROCS=2.

[streeve]

Try to set MPIEXEC_MAX_NUMPROCS=2.

@junghans I added to Travis, but it didn't seem to change anything

[junghans]

Try to set MPIEXEC_MAX_NUMPROCS=2.

@junghans I added to Travis, but it didn't seem to change anything

fixed

[streeve]

@sslattery this is ready for re-review