Problem: Precompiled headers not being used

Solution: Phase I - make precompiled.hpp be first file included in every source file

src/io_object.cpp

@@ -27,6 +27,7 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#include "precompiled.hpp"
 #include "io_object.hpp"
 #include "io_thread.hpp"
 #include "err.hpp"