Inspection does not register `CompatibilityVisitor` problems for its opened file language because in such a case
`UnsupportedFeatures` will annotate them.
Also `registerOnFirstMatchingVersion` methods were removed because
they could lead to duplication even if languages to register were different.
These checks will be Python version dependent due to additional
unpacking generalizations of Python 3.5.
The checks deal with only arguments, not argument-parameter mapping.
We're sure about our code analysis here so we've made them error
checks instead of warning checks.
