add a table_info.csv file in extractedData

[jeromedockes]

at the moment pubget outputs some data for each table: a csv file with the content of the table, and a json file with keys like table id, table label, table caption, and the path of the csv file

those are a bit hard to discover & use because they are stored in the article's individual directories, eg in
query_0dbec5035dc626ca916d0317b7b9a76f/articles/0b8/pmcid_7664275/tables/

it would be helpful to create a csv in the extractedData directory grouping the info for all tables in all articles. columns could be
pmcid,table_number,table_id,table_label,table_caption,n_header_rows,table_data_file

table_data_file would be the path to the table's csv, probably relative to the root of the query directory.
the other keys would be those currently provided in the JSON

[jeromedockes]

also maybe extract the content of the table-wrap-foot elements? those are footnotes so not sure if they contain useful information

[adelavega]

This would be great!

[jeromedockes]

also maybe extract the content of the table-wrap-foot elements? those are footnotes so not sure if they contain useful information

this part is done in #40