v1.7.3

• Fixed a bug where select.list_elements could fail rather than returning an empty result.
• Fix columns with spaces for math - should be referenced with underscores.
• Various remove_words bugs: fix dropped characters, non-string values and support a mixture of string/lists.
• Bugfix: ensure columns wildcard searches are treated as strings
• Support pickle files with the file connector
• Enable where for read
• Enable optional columns by adding a ?
• Bugfix: adjusted cosine similarity could fail due to floats being fractionally above 1
• Bugfix: capped adjusted cosine similarity score to 0-1 range.