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Scripts for v.33.11 cannot be used for v.33.12 when using dyntools. Now the optional variable 'outvrsn' has to be named in the calling function:
MyOUTVRSN = 0
# OK call for v.33.11:
chnfobj = dyntools.CHNF(outfile,MyOUTVRSN)
#OK call for v.33.12:
chnfobj = dyntools.CHNF(outfile,outvrsn=MyOUTVRSN)