fixing sorting/searching with localReader:{repeatitems:true}

Add "normalization" of initial `data` or the `data` added before trigger reloadGrid. If will be added named properties for the columns and for the id for **all** items of `data` array.

It's improved version of https://github.com/tonytomov/jqGrid/pull/619. The previous pull request added "normalized" properties **only for ittems of the current page** which was wrong. So the sorting (initial and the later) and searching could still work incorrect.