Added fix for python2 regex

Fix for python2 attributeError instead of TypeError on login with wrong openLDAP setting
Added default empty string on LDAPCertificate
Fix ldap as scheme for tls connection
Enabled add user on LDAP Authentication
LDAP config port is now number input
Added header for user import config
Added python ldap version to about section
Fix: It's no longer possible to login via fallback password as long as LDAP server is available
Fix: TypeError on bind is now catched and transformed to error message
Update Readme
Fixes for ldap

cps/ub.py

@@ -232,7 +232,7 @@ class Anonymous(AnonymousUserMixin, UserBase):
         self.sidebar_view = data.sidebar_view
         self.default_language = data.default_language
         self.locale = data.locale
-        self.mature_content = data.mature_content
+        # self.mature_content = data.mature_content
         self.kindle_mail = data.kindle_mail
         self.denied_tags = data.denied_tags
         self.allowed_tags = data.allowed_tags
@@ -441,14 +441,12 @@ def migrate_Database(session):
                             "locale VARCHAR(2),"
                             "sidebar_view INTEGER,"
                             "default_language VARCHAR(3),"
-                            "mature_content BOOLEAN,"
                             "UNIQUE (nickname),"
-                            "UNIQUE (email),"
-                            "CHECK (mature_content IN (0, 1)))")
+                            "UNIQUE (email))")
         conn.execute("INSERT INTO user_id(id, nickname, email, role, password, kindle_mail,locale,"
-                        "sidebar_view, default_language, mature_content) "
+                        "sidebar_view, default_language) "
                      "SELECT id, nickname, email, role, password, kindle_mail, locale,"
-                        "sidebar_view, default_language, mature_content FROM user")
+                        "sidebar_view, default_language FROM user")
         # delete old user table and rename new user_id table to user:
         conn.execute("DROP TABLE user")
         conn.execute("ALTER TABLE user_id RENAME TO user")