[users] Document passwordRequirements and code

src/modules/users/UsersPage.h

@@ -52,6 +52,12 @@ public:
     void setAutologinDefault( bool checked );
     void setReusePasswordDefault( bool checked );
 
+    /** @brief Process entries in the passwordRequirements config entry
+     *
+     * Called once for each item in the config entry, which should
+     * be a key-value pair. What makes sense as a value depends on
+     * the key. Supported keys are documented in users.conf.
+     */
     void addPasswordCheck( const QString& key, const QVariant& value );
 
 protected slots:

src/modules/users/users.conf

@@ -72,5 +72,5 @@ passwordRequirements:
     minLength: -1  # Password at least this many characters
     maxLength: -1  # Password at most this many characters
     libpwquality:
-        - minlen=8
+        - minlen=0
-        - minclass=2
+        - minclass=0