added basic card draw replacement,

auto=replacedraw choice damage:2

auto=replacedraw choice draw:2 noreplace

notice noreplace exempts the draw from sending a draw event. draw events and drawn events are seperate events.

added dredge and it's rules.

[card]
name=Dakmor Salvage
auto=tap
auto={t}:add{b}
dredge=dredge(2)
text=Dakmor Salvage enters the battlefield tapped. -- {T}: Add {B} to your mana pool. -- Dredge 2 (If you would draw a card, instead you may put exactly two cards from the top of your library into your graveyard. If you do, return this card from your graveyard to your hand. Otherwise, draw a card.)
type=Land
[/card]

projects/mtg/src/CardPrimitive.cpp

@@ -58,6 +58,7 @@ CardPrimitive::CardPrimitive(CardPrimitive * source)
     toughness = source->toughness;
     restrictions = source->restrictions ? source->restrictions->clone() : NULL;
     suspendedTime = source->suspendedTime;
+    dredgeAmount = source->dredgeAmount;
 
     magicText = source->magicText;
     for (map<string, string>::const_iterator it = source->magicTexts.begin(); it != source->magicTexts.end(); ++it)
@@ -82,6 +83,7 @@ int CardPrimitive::init()
     spellTargetType = "";
     alias = 0;
     restrictions = NULL;
+    dredgeAmount = 0;
     return 1;
 }
 
@@ -100,6 +102,11 @@ bool CardPrimitive::isSpell()
     return (!isCreature() && !isLand());
 }
 
+int CardPrimitive::dredge()
+{
+    return dredgeAmount;
+}
+
 void CardPrimitive::setRestrictions(string _restriction)
 {
     if (!restrictions)