Doc: enabling and disabling plugin dependencies

This now happens automatically and disabled plugins
are no longer a problem after version upgrade even if
plugin dependencies have changed.

Change-Id: I06456c81c2ad2fab5730562a4df407cf178fd1cf
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>

doc/src/howto/creator-cli.qdoc

@@ -108,11 +108,22 @@
 
        \row
             \li -load <plugin>
-            \li Load the specified plugin.
+            \li Enable the specified plugin and all plugins that it depends on.
+                You can combine \c -load and \c -noload options and specify both
+                options multiple times to enable and disable several plugins.
+                The actions are executed in the specified order.
+
+       \row
+            \li -load all
+            \li Enables all plugins.
 
         \row
             \li  -noload <plugin>
-            \li  Do not load the specified plugin.
+            \li  Disable the specified plugin and all plugins that depend on it.
+
+        \row
+            \li  -noload all
+            \li  Disables all plugins.
 
         \row
             \li  -profile

doc/src/overview/creator-configuring.qdoc

@@ -158,13 +158,11 @@
     New \QC plugins are often introduced as \e {experimental plugins} to let
     you try them out before they are fully supported. Experimental plugins
     are disabled by default and you must enable them for them to become visible
-    after you restart \QC.
+    after you restart \QC. By default, all the plugins that the plugin depends
+    on are also enabled.
 
     You can also disable plugins that you do not use, to streamline \QC.
-    However, this might cause problems when using another plugin later if the
-    dependencies between plugins are changed between \QC versions. Once you
-    manually disable a plugin, it stays disabled even when you upgrade to a
-    new \QC version, and you must manually enable it to be able to use it.
+    By default, all the plugins that depend on the plugin are also disabled.
 
     To enable and disable plugins, select \uicontrol Help > \uicontrol {About Plugins}.