Work on offer backend.

src/SerializedObject.h

@@ -30,8 +30,6 @@ enum SOE_Field
 	sfAccount,
 	sfAccountID,
 	sfAmount,
-	sfAmountIn,
-	sfAmountOut,
 	sfAuthorizedKey,
 	sfBalance,
 	sfBookNode,
@@ -52,6 +50,7 @@ enum SOE_Field
 	sfFlags,
 	sfGenerator,
 	sfGeneratorID,
+	sfGetsIssuer,
 	sfHash,
 	sfHighID,
 	sfHighLimit,
@@ -60,8 +59,6 @@ enum SOE_Field
 	sfIndexNext,
 	sfIndexPrevious,
 	sfInvoiceID,
-	sfIssuerIn,
-	sfIssuerOut,
 	sfLastNode,
 	sfLastReceive,
 	sfLastTxn,
@@ -81,6 +78,7 @@ enum SOE_Field
 	sfOfferSequence,
 	sfOwnerNode,
 	sfPaths,
+	sfPaysIssuer,
 	sfPubKey,
 	sfQualityIn,
 	sfQualityOut,
@@ -89,6 +87,8 @@ enum SOE_Field
 	sfSignature,
 	sfSigningKey,
 	sfSourceTag,
+	sfTakerGets,
+	sfTakerPays,
 	sfTarget,
 	sfTargetLedger,
 	sfTransferRate,