Added example for non-equi by=.EACHI case to ?data.table.
Added example for non-equi by=.EACHI case to ?data.table.

vlulla/data.table,jangorecki/data.table,Rdatatable/data.table,jangorecki/data.table,vlulla/data.table,Rdatatable/data.table,jangorecki/data.table,vlulla/data.table,vlulla/data.table,Rdatatable/data.table,Rdatatable/data.table,jangorecki/data.table