ft_extract_corpus Function removed. As part of focusing scope of the
package we're trying to limit dependencies, so downstream use of tm can
still easily be done.
pdfx: Function removed. We're trying to focus the scope of the package - and this function is more out of scope now.
chunks: Function name changed to ft_chunks()
tabularize: Function name changed to ft_tabularize()
collect: Function name changed to ft_collect()
cache_clear was never working anyway, and is now removed
ft_browse_sections: no sign that function used, and allows to remove a dependency
ft_get_si: moved to package suppdata
ft_chunks: moved to package pubchunks
ft_tabularize: moved to package pubchunks