Fixed bug #13

The estimate total now use the accounted value if its absolute value is
larger than the estimate's absolute value, using the math bellow:

```
fixed_estimate = (ABS(accounted) > ABS(estimated)
                    AND accounted > 0 == estimated > 0)?
                 accounted: estimated;
```

It gives more robustness for the evaluation, as the estimate accumulated
over the mounths becoming quickly useless.

OrcamentoMainFrame.cpp

@@ -321,19 +321,31 @@ void OrcamentoMainFrame::RefreshStatusBar()
         return;
     }
     try{
-        auto query= "SELECT "
-                    "    budget.name,"
-                    "    SUM(estimate.amount)/100.0,"
-                    "    SUM(execution_estimate.amount)/100.0,"
-                    "    (SUM(execution_estimate.amount) - SUM(estimate.amount))/100.0"
-                    "  FROM budget"
-                    "  JOIN estimate USING(budget_id)"
-                    "  LEFT JOIN (SELECT "
-                    "      IFNULL(SUM(execution.amount), 0) AS amount,"
-                    "      estimate_id"
-                    "    FROM execution GROUP BY estimate_id"
-                    "  ) execution_estimate USING(estimate_id)"
-                    "  WHERE budget_id = ?1"
+        auto query = R"==(
+SELECT
+    budget.name,
+    SUM(fixed_estimate.estimated)/100.0,
+    SUM(fixed_estimate.accounted)/100.0,
+    (SUM(fixed_estimate.accounted) - SUM(fixed_estimate.estimated))/100.0
+  FROM budget
+  JOIN (
+    SELECT
+      CASE WHEN ABS(execution_estimate.amount) > ABS(estimate.amount)
+        THEN
+          execution_estimate.amount
+        ELSE
+          estimate.amount
+        END AS estimated,
+      execution_estimate.amount AS accounted, budget_id
+    FROM estimate
+    LEFT JOIN (
+      SELECT
+        IFNULL(SUM(execution.amount), 0) AS amount, estimate_id
+      FROM execution GROUP BY estimate_id
+    ) AS execution_estimate USING(estimate_id)
+  ) AS fixed_estimate USING(budget_id)
+  WHERE budget_id = ?1
+        )=="
         ;
         SQLite::Statement stm(*_database, query);
         stm.bind(1, budget_id);