REF numpy >1.9 compatibility, indexing into empty slice closes #1754
Merge pull request #1771 from josef-pkt/REF_indexing_empty_1754

REF numpy >1.9 compatibility, indexing into empty slice closes #1754
REF: cov_params allow case of only cov_params_default is defined closes #1730
Merge pull request #1772 from josef-pkt/REF/BUG_covparams_1730

REF: cov_params: allow case if only `cov_params_default` is defined
DOC fix intend in docstring (LATEX Error)
DOC fix docstring model, wald_test, f_test, t_test, ContrastResults
DOC: add Summary, docstrings misc improvements
DOC: genmod cross-links, empty lines
DOC: GEE cross-links
Unindent 'hasconst' parameter heading in models doc closes #1656
DOC FIX fix extra params docstring, closes #1656 (previous commit didn't work)
DOC: formatting and add offset, exposure to discrete model docstring see #1817
DOC: add Poisson.fit_regularized.__doc__  [ci skip]
Merge pull request #1819 from josef-pkt/docwork

DOC Docwork
BUG: revert change to conf_int in PR #1819
Merge pull request #1820 from josef-pkt/fix_confint

BUG: revert change to conf_int in PR #1819
Added missing offset to starting value calculation
Rename eta to lin_pred
Docstring edits
Close second part of issue #1720