TST: increase precision for tsa.pacf_ols
TST: lower precision for normality tests, see #1113
TST lower precision in test_pca_svd closes #1113
    (lowering all by one, I cannot check)
ENH: add MNLogit loglike_and_score
ENH: mle lbfgs now uses simultaneous loglike and score, tested with MNLogit
MAINT: change default maxiter to match docstring
MAINT: do not tell lbfgs to approximate the gradient if we are already passing it a score function
MAINT: restore approx_grad flag superpowers
Merge pull request #1161 from argriffing/mnlogit-loglike-score

add a fitting interface for simultaneous log likelihood and score, for lbfgs, tested with MNLogit
Merge pull request #1157 from josef-pkt/tst_precision_master

TST: Fix precision in some tests. Closes #1113.