* optimized card loading. There was some redundant code that wasn't necessary.

* getCardByName seemed to have a initialization error if you tried to use it before the entire game loaded.  The cache would
throw an exception if you tried to use find and it was empty.  I put a guard around it to avoid this issue.

* refactored Zeth's "toggledifficuly" feature to be stored in meta data.  http://code.google.com/p/wagic/source/detail?r=3106
 -- This is slightly modified as it forces a 1 for 1 swap of cards that are specified.
    from the example given this is how it seemed to be used anyways.
 -- since all the information is stored in the meta data, there's no need to alter the deck's
    definition.

projects/mtg/src/DeckMetaData.cpp

@@ -96,6 +96,7 @@ void DeckMetaData::LoadDeck()
         mDescription = trim(deck.meta_desc);
         mDeckId = atoi((mFilename.substr(mFilename.find("deck") + 4, mFilename.find(".txt"))).c_str());
         mDeckLoaded = true;
+        mAlternateCardMap = deck.alternates;
     }
 
 
@@ -181,6 +182,11 @@ string DeckMetaData::getStatsSummary()
     return statsSummary.str();
 }
 
+map<int,int>& DeckMetaData::getAlternateMappings()
+{
+    return mAlternateCardMap;
+}
+
 void DeckMetaData::setColorIndex(const string& colorIndex)
 {
     mColorIndex = colorIndex;