- consistent with defining IO of int32_t/int64_t and with recent
changes to ensightFile. Using the primitives directly instead of
typedefs to them makes the code somewhat less opaque.
ENH: add Test-EigenMatrix application
The new iterative eigen decomposition functionality is
derived from:
Passalacqua et al.'s OpenQBMM (openqbmm.org/),
which is mostly derived from JAMA (math.nist.gov/javanumerics/jama/).
