option to enforce oauth for some users

Smarter merge of user groups

better translation handling on exceptions

removed obsolete settings from language files

remove HTML from language file

Enable login when self-registration is disabled

Update lang.php

Fixed typo in error message

Added dataporten lang option en

Add keycloak as identity provider

Added Auth0 as an Oauth2 IdP (Oauth2)

Do not attempt another login if the first failed

The user was constantly forwarded to their oauth provider if the login
did not succeed. To fix this the check for a valid session was moved to
the fr

Do not attempt another login if the first failed

The user was constantly forwarded to their oauth provider if the login
did not succeed. To fix this the check for a valid session was moved to
the front to handle all non-get requests and requests which are not
directed at doku.php.

Also delete the cookie if the (re-)login fails.

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Refactor user creation

Allow mailRestriction to multiple domains

Add option for custom redirect URI

If the wiki has per default a local TLD, it may be necessary to
specifies a public redirect URI for some services , e.g. Google, to
work.

Ensure a secure eMail restriction

Make the restriction apply to all oauth domains

Do not use hd and only check user afterwards

Add error message for denied login.

Add conf option to deny all but one hosted domain

Change default value from 'AllowAll' to ''

Change login-button according to SingleLogin value

Reword Single Service Option

Add option to limit possible login services

As requested in issue 10, add an option to only allow a single external
Service for login, while also deactivating authentication against local
database.

added config data for Doorkeeper example

show redirect URI to use in config manager

Added Yahoo! as another provider

this also adds our own storage class