Improve irow handling for 5250 output parameters

Retrieving output parameters is somewhat painful:

itool.add(iCmd('rtvjoba', 'RTVJOBA USRLIBL(?) SYSLIBL(?) CCSID(?N) OUTQ(?)'))
itool.call(itransport)
rtvjoba = itool.dict_out('rtvjoba')
if 'success' in rtvjoba:
    print(rtvjoba['row'][0]['USRLIBL'])
    print(rtvjoba['row'][1]['SYSLIBL'])
    print(rtvjoba['row'][2]['CCSID'])
    print(rtvjoba['row'][3]['OUTQ'])

you can fix it...

itool = iToolKit(irow=0)
itool.add(iCmd('rtvjoba', 'RTVJOBA USRLIBL(?) SYSLIBL(?) CCSID(?N) OUTQ(?)'))
itool.call(itransport)
rtvjoba = itool.dict_out('rtvjoba')
if 'success' in rtvjoba:
    print(rtvjoba['USRLIBL'])
    print(rtvjoba['SYSLIBL'])
    print(rtvjoba['CCSID'])
    print(rtvjoba['OUTQ'])

... but because irow is specified on the toolkit object instead of the iCmd object, it will break anything which actually returns rows. Should make it available on iCmd object (and make irow=0 the default for output parameters in the iCmd object).

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