bug#16959: bug#16981: 24.3.50; electric-pair-delete-adjacent-pairs broken in c-mode, python-mode, maybe-others

[Stefan]

>> Why do you think it is obsolete?
> Because every hint of its existence has been expunged from the documentation
> and the new advice seems to offer the same functionality.

Indeed, it's technically obsolete, but it's not declared officially
obsolete yet.  It will come, tho.  But it'll be with us for many years
to come.  OTOH its support is limited to keeping things working.

>>> BTW, the nadvice info could use some more examples and a note on how
>>> to transition from defadvice.
>> I'll leave this report open till someone does that.
> Some specifics:

I've installed some changes to try and address them.


        Stefan