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
MAINT: work in progress -- updating the matrix logarithm
MAINT: work in progress
MAINT: work in progress... adding fractional matrix power
ENH: Added != binop to BSR, CSC, and CSR files in sparsetools/ and
instantiate them.
ENH: Regenerated SWIG wrapper to accomodate changes with BSR, CSC, and
CSR.
ENH: Add == & != functionality for BSR, CSC, and CSR sparse matrices.
TST: Added tests for == & != operators for BSR, CSC, and CSR.
BUG: Homogenezie nnz type to be int for all sparse matrix types.
ENH: fractional matrix powers with tests
ENH: improved logm and tests
MAINT: move more shared code into an existing helper function
MAINT: change a function so that the docstring lies less
DOC: attempt to fix docstring markup for references but this is not tested
MAINT: delete commented-out values of theta which are not used; these could be added back if we want frechet derivatives
MAINT: the old logm is now completely replaced
BUG: fix a bug in my assert_raises usage