[facets] closes #1569459 (date-range facet with year < 1900)
use lgc.date.ustrftime() and lgc.date.ticks2datetime to convert js date ticks and
have a chance to handle dates with year < 1900.
/*
* 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;
}