Work in progress.

Most data series now have the option to go to external blocks, but
there are some bugs to iron out still. (It is failing make check.)


git-svn-id: svn://svn.code.sf.net/p/staden/code/io_lib@3606 ba6f2710-ca9f-427c-89d3-5bf716dbc8e1
Code tidyup, and now passing make check.


git-svn-id: svn://svn.code.sf.net/p/staden/code/io_lib@3607 ba6f2710-ca9f-427c-89d3-5bf716dbc8e1