* Passing --checkJs always sets --allowJS
Even if you have `"allowJs": false`. This is not a useful combination.
Changing this makes the compiler more friendly and easier to describe.
* only set allowjs if not explicitly set
* remove stray newline
* restore bad config error
* use an accessor function instead
* Add test case and temporarily disable inference
(Inference of class members from this-assignments inside a
prototype-assigned function.)
* Update baselines
* In blocks and source files, bind functions first
* Add tests from other bugs
* Remove temporary failsafe
* Update tests to restore intent and clean up errors
* Restore intent even better
* Restore intent even better x2
* Add missed baselines
