Bug fix to cram_dependent_data_series - it needs to always decompress
the CORE block. This didn't used to be compressed normally, but now
can be more easily.


git-svn-id: svn://svn.code.sf.net/p/staden/code/io_lib@3675 ba6f2710-ca9f-427c-89d3-5bf716dbc8e1