BLD: protect open file
BUG: generic likelihood explicit None check
Maint: gitignore: add dist (./dist doesn't work)
BUG: add missing ``__init__.py`` to test folder, add helper script
BUG/DOC: fix refactoring victims in ex_regressionplots
TST: TestProbitCG: increase optimization precision, closes #109
BUG/STY: omni_normtest propagate axis, closes #565, rest is cosmetic
DOC: AR, ARMA: don't copy base docstring, fix `See Also` names, closes #563
BUG: refactoring victim Influence, with SMOKE test, undefined k_vars
STY: move outlier_influence main into example script
REF/DOC: cleanup imports after move in last commit
BUG: remove dfbeta from outlier summary table, closes #552 with SMOKE test
STY: get rid of pylint messages in test_discrete
     (E1101 needs to be for every method of Check classes)
DOC: fix ex_random_panel for change in default of cov_nw_panel
Merge pull request #640 from josef-pkt/misc_fixes_05

Misc fixes 05  closes #639 and several others