Adds welcome message on registration Welcome message is only send out if podmin account is defined and welcome message is enabled in the config.

This also enables the podmin account to send messages
to any local user.

closes #6128

closes #6117

closes #6111

That is, if it's the first element in the post

closes #6110

closes #6085

closes #6060

closes #6079

closes #6041

closes #6022

and cleanup the code so it follows the code guidelines

closes #5955

closes #6028

closes #6020

The <hr> tag in the markdown-content was #eee,
and thus almost invisible. It has been changed to
$border-gray (currently #ddd) to be consistent
with the other <hr> tags.

Adjust markdown-content hr style further

The hr tag is now centered at 85% width. It also
adds a default vertical margin that is equivalent
to the 0.8em the paragraph tags provide.

Refactor scss for markdown-content hr

Closes #6016

closes #6013

closes #6007

closes #6005

- move mobile icons to mobile-folder, so they aren't included in the
  icons-sprite
- move logos to branding/logos, and create a logos-sprite without the
  big other branding-images
- delete duplicate images

closes #6004

closes #5991

closes #5992

closes #5988

Since the Facebook API has changed and additional permissions are required for all users on a pod to cross-post, an additional 'authorized' flag is needed to be set for the Facebook service.
This flag allows either all users, one user or no users to use the cross-posting service.

Clarifies the situation for #5923, #5260 and #5085.

closes #5985

closes #5986

closes #5983

closes #5978

closes #5975

regression from 1da1c53f203e6eb9dad50872e573a4965219ef92

closes #5976

last renamed in 8386179f

closes #5970

closes #5968