netsvc: Fix rpc exception string, install back-compat. loggers
netsvc: Fix rpc exception string, install back-compat. loggers

The exception string passed through OpenERPDispatcherException has not
been compatible with trunk server.

Install a compatibility logger (activated through debug.compat_logger),
that will enable trunk-addons to operate on this server
(eg. account.installer).

xrg/openerp-server,xrg/openerp-server