Updated available bolts

Following the requirements based on EN-1090 some bolt, nut and washer standards have been changed in Advance Steel 2016. The old DIN7991 is now available as EN ISO 10642. Also, washer standards DIN 125 and 126 have been replaced by EN ISO 7089 and EN ISO 7091 and the nuts from DIN 555 are now available under EN ISO 4034.