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: stats: Simplified the calculation of Pearson's R.

* Removed the common factor 'n' from the numerator and denominator in
  the calculation of Pearson's R.  (Closes the issue gh-2512.)
* Added basic tests of pearsonr. (All the existing tests were for perfect
  correlation or anticorrelation.)
* Modified stats.mstats.pearsonr to not raise RuntimeWarnings when abs(r) == 1.
stats: fix explicit formulas for the dlaplace stats
stats: replace a print() with a warning
Merge pull request #2556 from WarrenWeckesser/stats-pearsonr-calc

MAINT: stats: Simplified the calculation of Pearson's R.
add a test
Merge pull request #2563 from bburlo/print_warn

MAINT: stats: replace a print() with a warning
MAINT: rename test data files with invalid filenames on Windows. Closes gh-2558
tweak tests
BUG: runtests: pass extra arguments properly to Nose
MAINT: stats:  Use special.xlogy to compute entropy of discrete distributions.

This simplifies the code, and avoids spurious RuntimeWarnings that can occur
when a probability is 0.
Merge pull request #2553 from WarrenWeckesser/stats-ent-xlogy

MAINT: stats:  Use special.xlogy to compute entropy of discrete distributions
Merge pull request #2565 from rgommers/fix-git-on-windows

MAINT: rename test data files with invalid filenames on Windows.
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