added some basic unittests

changed warning/success message system to a new style
unified design of "hints" in form interfaces
fixed small bugs in "network" and "partition" plugin interfaces
"partition" and "disks" plugins: show blockdevice size during device selection
german translation for "disks" plugin added

pythonrewrite/plugins/system_preferences/show_plugins.cs

@@ -2,6 +2,8 @@
 
 <h1><?cs var:html_escape(Lang.Plugins.system_preferences.Title.Preferences) ?></h1>
 
+<?cs call:handle_messages() ?>
+
 <?cs # sort the Plugins - using the most stupid way :) ?>
 <?cs loop: order = #0, #100, #1
 	?><?cs # plugins ?><?cs each:x = Settings.PluginList

pythonrewrite/plugins/system_preferences/unittests.py

@@ -0,0 +1,8 @@
+import WebInterfaceTestClass
+
+class unittests(WebInterfaceTestClass.WebInterfaceTestClass):
+
+	def test_preferences_overview(self):
+		self.cmd.go(self.URL + "plugins/system_preferences?weblang=en")
+		self.cmd.find("Preferences")
+