BUG: pacf conf_int at 0 is 1,1, closes #1960
BUG GenericLikelihood ResultMixin add last obs to rvs, closes #1434
BUG/REF: numpy compat, don't use integer in tests, see #1901
TST: remove test noise, silence fit `disp`
Merge pull request #1987 from josef-pkt/bugs_tsa_base

BUG tsa pacf, base bootstrap