[patch][cla] NodeList.at() allow negative indexes

[Les]

NodeList?.at() is very flexible, e.g. it allows listing indexes like this:

dojo.query('form').children().at(2,1,0,0);

It would be nice to allow negative indexes, e.g.

dojo.query('form').children().at(0,-1);
dojo.query('form').children(0,-1); // <- this also would be nice
dojo.query('form').children().filter(0,-1);

[James Burke]

Pushing all enhancements to future, since we are close to locking down 1.4 beta.

[dante]

patch is attached to #10468 ... sorry I didn't notice this ticket.

[dante]

(In [21802]) fixes #10036 - make .at() allow negative indices with test and extended docs