ENH: linalg: sqrtm matrix square root speedup with tests and informal benchmarks
ENH: informal sqrtm benchmark
MAINT: remove redundant code
MAINT: use more vectorization
stats: fix explicit formulas for the dlaplace stats
add a test
tweak tests
MAINT: blocksize is now less confusing
Merge pull request #2532 from argriffing/sqrtm-with-sylvester

ENH: linalg: use a block algorithm for sqrtm
Merge pull request #2562 from bburlo/dlaplace

stats: fix explicit formulas for the dlaplace stats