Some of our Udacity listings added '(Udacity)' as and access note. This PR makes the practice uniform. We can consider other platforms case by case. In general, I feel that when the platform offers additional services that make it matter what platform a course is on, the addition of an access note is useful.

Comments welcome on appropriateness of  the access notes.

* Fixed non-working links

* Newline fix

* Fixed a link missing https://

* New AI course

* New Finnish AI course

* Elements of AI course in German

* Trailing slash fix

* Trailing slash fix

* Update free-programming-books-fi.md

* Fixed a link to author's own page

Found the original link from author's own page so there's no need to link to ResearchGate.

* Newline fix

* Update free-podcasts-screencasts-pt_BR.md

* Update free-podcasts-screencasts-pt_BR.md

* Free Finnish ebooks

* A few more Finnish books

* New Packt books

* Alphabetic order fix

* Added the rest of the free Packt ebooks

Microsoft Dynamics 365 Enterprise Edition Financial Management - Third Edition was left out because it's not really relevant.

* New section fix

* Updated the missing APL books

* Removed the trailing slash

* New Packt books

* Packtpub account mentions added

* New Python books from Packt

* Fixed alphabetical order

Parallel and Concurrent Programming in Haskell is now hosted on O'Reilly Safari.

* Added an OpenGL book to the Finnish list

* Added missing newlines and a translation

CA-Clipper 5.2 Norton Guide is not available anymore since last May, according to Archive.org and the nameserver changes made at the time. I changed the link to point to the latest archived page which seems to have quite a good coverage.

Removed the link to O'Reilly Commons because it doesn't exist anymore.

* Update free-programming-books-bl.md

* Update free-programming-books-bl.md

* Update free-programming-books-bl.md

* Update free-programming-books-bl.md

* Update free-programming-books-bl.md

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