Allow a single client-web to connect to different openerp servers

Today, client web connects to the openerp server given in its configuration file at start time. This means that if you run several openerp servers, you have to set up and start several client-web instances. Consequently, unused client-web instances reserve host resources, in particular memory, and a complex virtual-host management must be set up just to direct the user to the right interface, in fact for nothing from a functionnal standpoint.
From openerp-client, a single instance is enough because you can set your parameters <protocol, host, and port> in the login window.
Porting the same flexibility from openerp-client to client-web by allowing a single client-web instance to interface with many openerp-servers would be an important improvement.