Some more const-correctness in engine functions.

git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@18873 57a11ea4-9604-0410-9ed3-97b8803252fd

src/engine/Split.c

@@ -1261,7 +1261,7 @@ xaccSplitsComputeValue (GList *splits, const Split * skip_me,
 }
 
 gnc_numeric
-xaccSplitConvertAmount (const Split *split, Account * account)
+xaccSplitConvertAmount (const Split *split, const Account * account)
 {
     gnc_commodity *acc_com, *to_commodity;
     Transaction *txn;

src/engine/Split.h

@@ -75,7 +75,7 @@ GType gnc_split_get_type(void);
  * in particular we want to convert the Split to be in to_commodity.
  * Returns the amount.
  */
-gnc_numeric xaccSplitConvertAmount (const Split *split, Account * account);
+gnc_numeric xaccSplitConvertAmount (const Split *split, const Account * account);
 
 /*-----------------------------------------------------------------------
  * Splits

src/engine/Transaction.c

@@ -968,7 +968,7 @@ xaccTransGetAccountAmount (const Transaction *trans, const Account *acc)
 }
 
 gnc_numeric
-xaccTransGetAccountConvRate(Transaction *txn, Account *acc)
+xaccTransGetAccountConvRate(const Transaction *txn, const Account *acc)
 {
     gnc_numeric amount, value, convrate;
     GList *splits;

src/engine/Transaction.h

@@ -398,7 +398,7 @@ gnc_numeric xaccTransGetAccountAmount (const Transaction *trans,
  *
  * If 'acc' is NULL, return unity.
  */
-gnc_numeric xaccTransGetAccountConvRate(Transaction *txn, Account *acc);
+gnc_numeric xaccTransGetAccountConvRate(const Transaction *txn, const Account *acc);
 
 /** Get the account balance for the specified account after the last
     split in the specified transaction. */