GitLab

Prevent the possibility of entering '@' in the fields of 'room' and 'server' in the manage bookmarks dialog.
Set the selection at startup manage bookmarks dialog.
Fix var name in dialogs.py

[lemonyogster] don't allow to put @ in room entry in join groupchat dialog and automatically switch to server entry. see #5528

Also use sed to remove now unneeded Vim lines, 2to3 -f ws_comma to fix
some whitespace, and fix some other madness manually.

Fixes #5668, #5651