Make the Year spinbox in the music metadata editor easier to use.

* Add zero (no year) as a special value
* Change the range from 0-9999 to 1000-Current Year
* Reverse the order so that we start at the current year and spin back

Technically the year in metadata indicates the year of recording not
the year of composition, so we could pick a minimum year from the
point in time when the first audio recordings were being made
(~1860s).

mythplugins/mythmusic/mythmusic/editmetadata.cpp

@@ -359,12 +359,13 @@ bool EditMetadataDialog::Create(void)
         return false;
     }
 
-    m_yearSpin->SetRange(0, 9999, 1);
-    m_trackSpin->SetRange(0, 9999, 1);
+    m_yearSpin->SetRange(QDate::currentDate().year(), 1000, 1);
+    m_yearSpin->AddSelection(0, "None");
+    m_trackSpin->SetRange(0, 999, 1);
 
     if (m_ratingSpin)
     {
-        m_ratingSpin->SetRange(0, 10, 1);
+        m_ratingSpin->SetRange(0, 10, 1, 2);
         connect(m_ratingSpin, SIGNAL(itemSelected(MythUIButtonListItem*)),
                 SLOT(ratingSpinChanged(MythUIButtonListItem*)));
     }