Added new helper to find the best file size format given a long with file size in bytes.

Added view under system to see which folders have not been processed in dropDir.

NzbDrone.Core/Helpers/FileSizeFormatHelpercs.cs

@@ -0,0 +1,49 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace NzbDrone.Core.Helpers
+{
+    public class FileSizeFormatHelper
+    {
+        private const Decimal OneKiloByte = 1024M;
+        private const Decimal OneMegaByte = OneKiloByte * 1024M;
+        private const Decimal OneGigaByte = OneMegaByte * 1024M;
+
+        public static string Format(long bytes, int precision)
+        {
+            if (bytes == 0)
+                return "0B";
+
+            decimal size = Convert.ToDecimal(bytes);
+
+            string suffix;
+
+            if (size > OneGigaByte)
+            {
+                size /= OneGigaByte;
+                suffix = "GB";
+            }
+
+            else if (size > OneMegaByte)
+            {
+                size /= OneMegaByte;
+                suffix = "MB";
+            }
+
+            else if (size > OneKiloByte)
+            {
+                size /= OneKiloByte;
+                suffix = "KB";
+            }
+
+            else
+            {
+                suffix = " B";
+            }
+
+            return String.Format("{0:N" + precision + "}{1}", size, suffix);
+        }
+    }
+}