convert a few doctests to shell test format

tests/missing-real-and-virtual-amt.test

@@ -0,0 +1,20 @@
+register
+<<<
+2009/6/24 carwash
+    equity:draw:personal:transportation:car:carwash     $3.50
+    assets:cash
+    [expenses:car]                                      $3.50
+    [simon]
+>>>
+>>>2
+"-" (line 6, column 1):
+unexpected end of input
+could not balance this transaction, amounts do not add up to zero:
+2009/06/24 carwash
+    equity:draw:personal:transportatio         $3.50
+    assets:cash                                     
+    [expenses:car]                             $3.50
+    [simon]                                         
+
+
+===0

tests/sample-balance-depth.test

@@ -0,0 +1,9 @@
+-f sample.ledger balance --depth 1
+<<<
+>>>
+                 $-1  assets
+                  $2  expenses
+                 $-2  income
+                  $1  liabilities
+>>>2
+===0

tests/sample-balance-o.test

@@ -0,0 +1,11 @@
+-f sample.ledger balance o
+<<<
+>>>1
+                  $1  expenses:food
+                 $-2  income
+                 $-1    gifts
+                 $-1    salary
+--------------------
+                 $-1
+>>>2
+===0

tests/sample-balance.test

@@ -0,0 +1,15 @@
+-f sample.ledger balance
+<<<
+>>>1
+                 $-1  assets
+                  $1    bank:saving
+                 $-2    cash
+                  $2  expenses
+                  $1    food
+                  $1    supplies
+                 $-2  income
+                 $-1    gifts
+                 $-1    salary
+                  $1  liabilities:debts
+>>>2
+===0

tests/unbalanced.test

@@ -0,0 +1,17 @@
+; shouldn't exit code be 1 ?
+register
+<<<
+2009/1/1 a
+  b  1.1
+  c  -1
+>>>
+>>>2
+"-" (line 4, column 1):
+unexpected end of input
+could not balance this transaction, amounts do not add up to zero:
+2009/01/01 a
+    b                                            1.1
+    c                                             -1
+
+
+===0