Better result formatting

Cells holding a NULL value now display null in gray.
int, float and numeric columns are right aligned. Integers, floats and numerics are coloured.
Booleans, green or red for true or false. t, f is replaced by TRUE, FALSE

PgsqlConn.cpp

@@ -163,6 +163,15 @@ const char * Result::getVal(int col, int row) const
     return PQgetvalue(result, row, col);
 }
 
+Oid Result::type(int col) const
+{
+	return PQftype(result, col);
+}
+
+bool Result::null(int col, int row) const
+{
+	return PQgetisnull(result, row, col);
+}
 
 Canceller::Canceller(PGcancel *c)
 	: m_cancel(c)