* [release] v4.0
* Better building.
* Much more robust temp file cleaning and messages shown.
* Complete refactor of the Downloader utility to assure never stalls.
* Refactored Downloaders lifecycle, polishing several, much more robust now.
* Better chapter numbering representation for CDA episodes.
* Little detail in CDA scrapping.
* Store separated the info in CDA metadata.
* Start pending downloads async in the future, so QtNetworkManager works.
* Avoid storing duplicated programs in CDA.
* Moved new backends to a new list, for updated code only.
* Fixed downloader for ted1 talks.
* Support an imported but failing lib when notification.
* Two small fixes of future unicode and print.
* New backend to download.
* CDA backend (based on research and some code from Manuel Kaufmann).
* Update copyright in authors.txt
* Prepare on server, show and download episodes from some TEDxs.
* Better parsing of Conectate pages.
* Improve the GUI behaviour when listing is filtered.
* Better detection of repeated programs in DQSV.
* Support SWF with warnigns.
* Better instructions for install and run tests.
* Filenames cleaned to ascii to be saved anywhere.
* Improved management of error while downloading.
* Instructions for md5sum.
* Changes after release: better web page, docs, etc.