Fix rebase conflict
Update docstring of RegressionModel.predict()

Fixes #1614
TST: add Stata results for SVAR example
TST: SVAR add tests for params and bse
TST: SVAR add test for llf and information criteria
Merge pull request #1676 from josef-pkt/tests_svar

TST: Tests for SVAR
Merge pull request #1635 from kshedden/glm_offset5

REF/BUG Allow offset and exposure to be used together with log link, see #1486
Merge pull request #1677 from chatcannon/RegressionPredictDoc

DOC Update docstring of RegressionModel.predict()