Reclassification of easy hacks completed

[Ilmari Lauhakangas]

We now have three difficulty levels of easy hacks, Beginner, Medium and 
Interesting. difficultyBeginner now refers to tasks that are good for 
newcomers in getting them to quickly move through the entire 
contribution process, from setting up a development environment to 
getting their patch reviewed.

Definitions in the wiki: 
https://wiki.documentfoundation.org/QA/Bugzilla/Fields/Keywords#EasyHack

I evaluated all Beginner level hacks and reclassified them as Medium 
where I thought it was appropriate.

Here are the current difficultyBeginner tasks:
https://bugs.documentfoundation.org/buglist.cgi?keywords=easyHack%2C%20difficultyBeginner%2C%20&keywords_type=allwords&list_id=1101666&query_format=advanced&resolution=---

difficultyMedium tasks:
https://bugs.documentfoundation.org/buglist.cgi?keywords=easyHack%2C%20difficultyMedium%2C%20&keywords_type=allwords&list_id=1101673&query_format=advanced&resolution=---

If you think something is in the wrong category, please adjust it.

Ilmari