Changed string error codes to ints
Using std::error_code in error handler
Removed fatal_error method from error_handler
Use std::error_code in error handler
The error_handler virtual implementation methods have been renamed to do_warning and do_error, and made private. Non virtual public interface methods warning and error have been added.
Updates to docs
Updates to docs
Updates to docs
Updates to docs
Updates to docs
Cleanup
Updates to docs
Updates to docs