Improvements to wiki
Please, make the following changes to the wiki in order to improve it:
- Remove the dead line on http://wiki.davical.org/index.php/Suggest_Features and update the text. Perhaps add a link to https://gitlab.com/davical-project/davical/issues
- Add on http://wiki.davical.org/index.php/Installation_Stuff under Miscellaneous the text 'davical2abook - script for regularly exporting contacts to SquirrelMail's address book' with a link on davical2abook to https://github.com/PanderMusubi/davical2abook