- Major changes:
* added search_meta() and find_id() functions, to allow for
the selection of data item series_IDs, based on search-terms
over the meta data.
* added a cache_only flag to read_abs_cat() and read_abs_series(),
allowing for offline coding/testing.
- Minor changes:
* Minor edits to the README.md file.
* Added a module comment to 'get_data_links.py'
* Corrected a typo in the module comment for 'generate_catalogue_map.py'
* changed the m_periods parameter in percent_change() to n_periods
* added this change log
* Updated version number in '__init__.py'
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