cbcBayesMCMC2pos.py: remove duplicate metadata of posterior samples
This fixes #250 (closed).
cbcBayesMCMC2pos copies all of the metadata from the original posterior samples .hdf5 file to the output .hdf5 file.
Some copied metadata are duplicated with columns, which causes errors when ligo.skymap reads the posterior samples.
This patch removes metadata duplicated with columns to solve this issue.
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