onelab: "Refresh" to manually refresh the display while codes are running + send Action=stop to clients when a stop is requested

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Trying to sort out weird and unstable behauviour after injecting homology computation results to GModel ... 

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never show the message console on startup: this reverts to the old behaviour when we had a separate message window

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First pass at cleaning up lists in the .geo parser: 

- we now keep track of the variable type ("list of floats" or "single float")
- the brackets [] after the variable id are now optional (aa={1,2} == aa[]={1,2}) when creating a new list
- the old syntax is kept to enable forcing the type to "list of floats" when creating a single-entry list
- on single floats, += performs the usual arithmetic operation; on lists, += appends to the list (idem for -=)

WARNING! this is a possibly dangerous commit: please test your .geo files and your scripts and signal any weird behaviour

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