Added two new regression tests

These prove Simon's recent balance report bugs.

test/regress/461980A1.test

@@ -0,0 +1,13 @@
+bal
+<<<
+2008/1/1 one
+  test:a  1
+  test:b
+>>>1
+                   0  test
+                   1    a
+                  -1    b
+--------------------
+                   0
+>>>2
+=== 0

test/regress/E9F130C5.test

@@ -0,0 +1,30 @@
+bal as
+<<<
+2008/01/01 income
+    assets:bank:checking  $1
+    income:salary
+
+2008/06/01 gift
+    assets:bank:checking  $1
+    income:gifts
+
+2008/06/02 save
+    assets:bank:saving  $1
+    assets:bank:checking
+
+2008/06/03 * eat & shop
+    expenses:food      $1
+    expenses:supplies  $1
+    assets:cash
+
+2008/12/31 * pay off
+    liabilities:debts  $1
+    assets:bank:checking
+>>>1
+                 $-1  assets
+                  $1    bank:saving
+                 $-2    cash
+--------------------
+                 $-1
+>>>2
+=== 0