BUG: fix weight handling, fails in some cases, see #987
BUG: Cleanup incorrectly defined names
STY: Pep-8
Merge pull request #1600 from jseabold/regression-plots-fixes

CLN: Regression plots fixes
TST: Add test for start_params in GLM
ENH: Allow start_params in GLM. Closes #443.
STY: Pep-8 cleanup
TST: Test corner case from #1604.
Merge pull request #1603 from jseabold/glm-start-params

ENH: Allow start_params in GLM
TST: adjust precision, CI Debian, Ubuntu testing
Merge pull request #1607 from josef-pkt/TST_fix_test_precision

TST: adjust precision, CI Debian, Ubuntu testing
TST: add failing test, bug #1221
REF/ENH: add `_init_keys` to recreate model closes #1221 closes #1609
TST: change smoke test results negbin geometric llnull
TST: TestProbitCG.test_conf_int use relative error (intermittend test failure)
BUG: proportions_chisquare_allpairs, fix hardcode pairs closes #1493
TST: predstd move __main__ to a test module
BUG: wls_prediction_std: fix if weight is scalar
CLN: pep-8
TST: wls_prediction_std: additional tests