Remove manual chunks option in Posterior. Automatic compression is rapid.

Merged Chris Jewell requested to merge fix-posterior-compression into master

Previously, a user of gemlib.mcmc.Posterior needed to specify an HDF5 chunk size in order to turn on compression. Poor choices of compression seriously impact read performance, and the HDF5 default chunk size was found to perform much better in terms of both compression ratio and read performance. This option has now been removed.

This is a breaking change!

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