* Rewrites:
- moved PAGE_* to Friendica\Model\Profile class
* Fixed more rewrites from plain (global namespace) PAGE_* to Friendica\Models\Profile class
* CR request:
- moved all PAGE_* constants to Friendica\Model\Contact class
- fixed all references of both classes
* CR request:
- moved ACCOUNT_TYPE_* constants from boot.php to Contact::ACCOUNT_TYPE_*
* Just copy-pasted this code from boot.php, needs to be changed to `const ACCOUNT_TYPE_FOO = x;`
* Ops, melting brain cells here ... :-/
* Some more warnings removed
* Even more warnings ...
* Will it ever end? ;-)
* Avoid warning in dbstructure
* Origin and OStatus ...
* There are more warnings solved ... yeah!
* And again ...
* We are not done yet
* And more ...
* And some new places ...
* And more in the feeds
* Avoid some more
* And some backend stuff
* Notifications cleared
* Some more stuff
* and again ...
* It's getting fewer ...
* Some warnings had been hidden in the notifications
* Fix the fix
* And another missing one ...
* We need the owner here, not the user
* Forgotten user
* And more ...
* And some more warnings disappeared ...
* Some more frontend warnings
* Some backend warnings removed
* Fixed sidebar for "vier"
* And more ...
* Some more ...
* And something for "remote self"
* Am I stuck in an endless loop?
* Fix: Clear tag and file field on update
* Preset page content
* Improve group-editing and edit-navigation.
Use icons next to groups and header for navigation to editing groups and adding new groups.
Also use icon from group-sidebar for editing groups.
* Unify look&feel of contact search bars.
* Remove nogroup page and replace with /group/none.
* Make sure proper items are selected in aside.
* Use icon instead of link for 'View Contacs' on profile page.
* Fix none-working /group/none.
* Fix highlighting for everyone in group aside.