Keep last page label in separate property

This allows using values such "100+" for lastpage. They get parsed as
"100" and stored in "lastpage" and original text is stored in
"lastpagelabel". One can also send completely different label as
"lastpagelabel".
Merge branch 'noFormatterOnPagesTotals' into szp

Conflicts:
	js/jquery.jqGrid.js
Make sure loading message is always visible

In case of grids taller than browser window height, when using refresh
button on the bottom of the grid we could not see loading message, which
showed up on the top of the grid.
Merge branch 'alwaysVisibleLoading' into szp