Return the configuration (header_) value for the current plugin.

        ...or the one given by the plugin_name var.

def get_conf_value(self, value, header="", plugin_name=None):
        """Return the configuration (header_) value for the current plugin.

        ...or the one given by the plugin_name var.
        """
        if plugin_name is None:
            # If not default use the current plugin name
            plugin_name = self.plugin_name

        if header != "":
            # Add the header
            plugin_name = plugin_name + '_' + header

        try:
            return self._limits[plugin_name + '_' + value]
        except KeyError:
            return []