add documentation

EDPlayerJournal/Mission.cs

@@ -338,6 +338,10 @@ public class Mission : IComparable<Mission> {
         return string.Join("", results);
     }
 
+    /// <summary>
+    /// A convenient Dictionary containing all influences given out by faction,
+    /// then by system address and then by influence handed out.
+    /// </summary>
     public Dictionary<string, Dictionary<ulong, string>> Influences {
         get {
             return FactionEffects