Removed unused status_messages.php include in data_usage.php.
Use single quote style in bandwidthcharts.js.
Signed-off-by: D9ping <D9ping@users.noreply.github.com>
Use ajax for getting bandwidth data.
Added support for adding extra scripts in footer if needed.
Signed-off-by: D9ping <D9ping@users.noreply.github.com>