provide better feedback for timeouts

Registered by Ferdinand

IMHO the user needs to be provided with some usefull information if timeout occurs
- "retry in a few minutes"
- "visit the following page/link to inspect the reason for timeout"
-- network connection broken
-- server to busy
-- deadlock ?

Provide an option to continue waiting - important !

please look also into
https://blueprints.launchpad.net/openobject-client/+spec/cursour-busy

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