verify uploads and playout

check if attributes for uploaded audio match expected ranges and mark
them by colors to help finding issues with duration, channels, RMS, mode
(CBR, ABR), bitrate.

increase upload limit to 400 MB for audio

website/agenda/planung/css/calendar.css

@@ -443,6 +443,11 @@ div#toolbar input.search{
     display:none;
 }
 
+#calendar div.event:hover {
+    min-height: 4rem!important;
+    z-index:99;
+}
+
 #calendar div.ui-draggable-dragging{
     z-index:99;
     cursor:move;
@@ -497,3 +502,13 @@ div.play .error{
     padding-right:32px;
 }
 
+
+#content div.ok,
+#content div.warn,
+#content div.error{
+    padding-top:3px;
+    padding-bottom:3px;
+    margin:1px;
+    border-radius:4px;
+    text-align:center;
+}