srf.formats.datatables() add column class using datavalue typeId

Change from aoColumns to aoColumnDefs in order to add a
typeId related CSS class which can be used to alter type
specific in-table formatting rules via CSS

/* Type dependant formatting */
.srf-datatables .smwtype_num {
	text-align: right;
}

@see http://www.datatables.net/usage/columns

Change-Id: I646faa68047dbb00cdde54e2f25e43ad58fcf5db
Merge "srf.formats.datatables() add column class using datavalue typeId"