BUG: fix weighted cov and corrcoef, fix std_mean and ttest ddof!=0, add tests, closes: #370
BUG: sandbox densityorthopoly add missing import
TST: fix bug with std in last commit, more tests, cleanup
ENH: weightstats: add options to ttest, add TOST
BUG: weightstats wrong confint_mean
TST/ENH: weightstats, more tests, add diff value option to ttest_ind function
ENH: weightstats: add get_compare, confint for 2sample diff
TST/ENH: weightstats, tost transform and tests
BUG: fix two methods, remove levene, 98% coverage
DOC: weightstats docstrings and some cleanup
TST: tost add test for asymmetric bounds
REF: change sign in tstat_generic
ENH: vectorized TOST (multiple-endpoints)
ENH: tost vectorized works with transform
TST: smoketests for broadcasting
DOC/STY: weightstats: work on docstrings, some pylint cleanup
REF: rename method, add to returns
ENH/REF: add tost method to DescrStatsW, privatize 2 functions, change in a return
ENH: add power for t-tests, initial commit (script file)
REF: cleanup initial script, remove experimental parts