fixes tpcc table issues
 * W_STREET1/2 => W_STREET_1/2 (as in tpcc specification)
 * W_TAX and W_YTD to D_~ in DISTRICT TABLE
 * name of loaded tables to upper case (used them in my queries)
 * removed UTF8 BOM from tbl files (the hyrise loader doesn't like them)
 * corrected O_IDs in NEW_ORDER
 * better D_NEXT_O_IDs (not 3001 but max(o_id) + 1)
 * O_D_ID to existing D_IDs (always 1)
 * orderlines for every order
 * existing I_IDs for O_I_ID