Currently astroid goes into a total revamp, having a couple of development branches with partially
incompatible APIs, which means that pylint can't rely on the exact location of has_known_bases
and safe_infer until astroid reaches a new major release. With this in mind, these two
functions are backported in pylint again.
Also improve a couple of imports and added support for the
old visit_ names. Priority will have the old visit_ names, such
as visit_discard over visit_expr, visit_callfunc over visit_call
etc.
