fix setcols
fix setcols

i think this is correct now.  example:

instr 1
iArr[][] init 3, 4
iCol[] fillarray 1,2,3
printarray iArr, "%d", "array at start:"
iArr setcol iCol, 3
printarray iArr, "%d", "array after setcol:"
endin
schedule(1,0,0)

instr 2
kArr[][] init 3, 4
kCol[] fillarray 1,2,3
printarray kArr, 1, "%d", "array at start:"
kArr setcol kCol, 3
printarray kArr, 1, "%d", "array after setcol:"
turnoff
endin
schedule(2,0,1)

what is missing: error message if desired column does not exist, e.g.
iArr setcol iCol, 3
csound/csound,csound/csound,csound/csound,csound/csound,csound/csound,csound/csound,csound/csound,csound/csound,csound/csound,csound/csound