Modify query_error() to log errors to a database table instead of displaying them on the screen. This should

let us more easily debug difficult or intermittent issues that users may not report. Add a cron to report logged
errors to appdb admins every night.  Implement some basic unit tests for the new error logging code

unit_test/test_error_log.php

@@ -0,0 +1,40 @@
+<?php
+
+require_once("path.php");
+require_once(BASE."include/incl.php");
+
+function test_error_log_log_error()
+{
+    error_log::log_error(ERROR_SQL, "This is a sql error");
+    error_log::log_error(ERROR_GENERAL, "This is a general error");
+
+    /* make sure the error log count matches what we expect */
+    $iExpected = 2;
+    $iActual = error_log::getEntryCount();
+    if($iActual != $iExpected)
+    {
+        echo "Expected error_log::getEntryCount() of ".$iExpected." got ".$iActual;
+        return false;
+    }
+
+    error_log::flush(); /* flush the error log */
+
+    /* make sure the error log count matches what we expect */
+    $iExpected = 0;
+    $iActual = error_log::getEntryCount();
+    if($iActual != $iExpected)
+    {
+        echo "Expected error_log::getEntryCount() of ".$iExpected." got ".$iActual;
+        return false;
+    }
+
+    return true;
+}
+
+
+if(!test_error_log_log_error())
+    echo "test_error_log_log_error() failed!\n";
+else
+    echo "test_error_log_log_error() passed\n";
+
+?>