Fix the copyright section to point out that it's not part of Emacs.
Don't explicitly bind mouse-1.

As Michael Heerdegen <michael_heerdegen@web.de> says:

However, also binding mouse-1 is not necessary.  Depending on the
setting of `mouse-1-click-follows-link', which is non-nil by default,
mouse-1 already follows links - see its doc.  We should leave it up to
the user if he wants to use mouse-1 for following or not.
Revert the previous copyright change.

GNU ELPA things are part of Emacs.
* js2-mode: merge from upstream

Lots of small changes, too many to enumerate.
Re-apply the Toggles -> Toggle wording change
* js2-mode: same for Returns -> Return
notes-mode/mkconfig: don't reference undefined envvar NOTES_BIN_DIR