MAINT: Remove deprecated ARMA order argument
MAINT: Remove deprecated names argument.
MAINT: Remove deprecated confint argument.
MAINT: Remove from deprecated namespace
MAINT: Remove deprecated methods/attributes.
MAINT: Remove deprecated KDE class
MAINT: Change deprecated signature.
MAINT: Remove deprecated attribute.
MAINT: Silence tests
MAINT: Silence test
Merge pull request #2035 from jseabold/remove-deprecated

MAINT: Remove deprecated code for 0.6