it is no longer required with the latest ERP5 code where we have explicit ORDER BY in the outer query.
also drop it in generic_mysql too.

The link was pointing to the RSS url itself instead of
pointing to the monitoring interface.

also add --disable-host-tool option to prevent possible installation
error that happens when pkg-config is rebuild without removing
parts/pkg-config directory.

Fixing almost random error: cannot get `parentNode` of null

More information available on the README file.

This reverts commit b3c5f181.