When saving eigenvectors, LapEvec now saves eigenvalues for every timeslice as well.

I.e. nT x nVec eigenvalues are saved in FileName.evals.conf.h5.
A new named tensor, "TimesliceEvals" can be used to simplify restoring these from disk.
NB: The changes in BaseIO add support so that Eigen tensors can be easily used in MPI operations, e.g. GlobalSum.
See LapEvec.hpp for an example of how this is done.

Hadrons/Modules/MDistil/Perambulator.cc

@@ -53,5 +53,8 @@ const std::array<std::string, 4> NoiseTensor::DefaultIndexNames__{"nNoise", "nT"
 const std::string                PerambTensor::Name__{"Perambulator"};
 const std::array<std::string, 6> PerambTensor::DefaultIndexNames__{"nT", "nVec", "LI", "nNoise", "nT_inv", "SI"};
 
+const std::string                TimesliceEvals::Name__{"TimesliceEigenValues"};
+const std::array<std::string, 2> TimesliceEvals::DefaultIndexNames__{"nT", "nVec"};
+
 END_MODULE_NAMESPACE
 END_HADRONS_NAMESPACE