[dataimport] make eids_seq_range as massive store instance attribute again
I changed it to a class attribute recently, but on further thought (and
prompting from Adrien) it seems to make more sense as an instance
attribute.
/*
* cubicweb js mock for unit tests
* This module defines variables and functions used in quite a few places
* in cw js framework that can't be used or guessed without a real CW server
*/
var pageid = 'my-page-id';
function _(message) {
return message;
}