fix account mapping in csv conversion

By using payees_for_unknown_accounts instead of account_mappings in
csv.cc ledger will have the same behaviour as in `ledger -f - print`
in that it uses payee fields in account directives to rewrite the
account.

src/csv.cc

@@ -243,7 +243,7 @@ xact_t * csv_reader::read_xact(bool rich_data)
 
   // Translate the account name, if we have enough information to do so
 
-  foreach (account_mapping_t& value, context.journal->account_mappings) {
+  foreach (account_mapping_t& value, context.journal->payees_for_unknown_accounts) {
     if (value.first.match(xact->payee)) {
       post->account = value.second;
       break;

test/baseline/feat-convert-with-diretives.dat

@@ -0,0 +1,3 @@
+date,payee,amount
+2012/01/01,KFC,$10
+2012/01/02,"REWE SAGT DANKE  123454321",10€

test/baseline/feat-convert-with-diretives.test

@@ -0,0 +1,28 @@
+account Expenses:Food
+    payee KFC
+    payee REWE
+
+payee REWE
+    alias REWE SAGT DANKE
+
+# When reading csv file without directives:
+test -f /dev/null convert test/baseline/feat-convert-with-diretives.dat
+2012/01/01 * KFC
+    Expenses:Unknown                             $10
+    Equity:Unknown
+
+2012/01/02 * REWE SAGT DANKE  123454321
+    Expenses:Unknown                             10€
+    Equity:Unknown
+end test
+
+# When reading csv file with directives:
+test --account "Assets:Cash" convert test/baseline/feat-convert-with-diretives.dat
+2012/01/01 * KFC
+    Expenses:Food                                $10
+    Assets:Cash
+
+2012/01/02 * REWE
+    Expenses:Food                                10€
+    Assets:Cash
+end test