list all contributions (title, speaker, material links) in a category

[jmonnich]

Feature request from a support ticket:

A way to export a table of all contributions (title, speaker, links to material) in a given category, perhaps with a date filter

consider the common situation with a series of weekly meetings, each with 1 to 3 presentations on topics that are part of a particular project..one often needs to look at the series of two talks per week over 25 weeks as an 'event'. so having a table of title,author, link to material, date would be very helpful. Useful for finding the last, I.e. most correct status of a topic, our finding a talk when you cannot remember the proper keywords or speaker.