ENH: linalg: sqrtm matrix square root speedup with tests and informal benchmarks
ENH: informal sqrtm benchmark
MAINT: remove redundant code
MAINT: use more vectorization
MAINT: blocksize is now less confusing
Merge pull request #2532 from argriffing/sqrtm-with-sylvester

ENH: linalg: use a block algorithm for sqrtm