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hide widgets to make sure they don't get events when they are removed from the tree, but have not yet been deleted

there's no need to impose unique client names on the server: it just complicates everything - so let's remove this limitation

geometry. It introduces subtle bugs when reading high-order post-processing views.

IMHO we should have an explicit command to do this, and not modify the mesh without
warning just by reading a file

- ParseString can now run in the current model directory (useful when parsing things with relative filenames)
- New View.Time option to select the timestep according to the time value

Implementation of the client-based flag -changed- for python clients (native and interfaced). Plus some cleanup.

Store one "changed" flag per client; this allows to correctly detect which client needs to be run when a parameter is changed.

Warning: this changes the onelab protocol: now at version 1.1 -- you'll need to upgrade all your clients.

fine-tune setChanged (the real fix will be to store the _changed attribute for each client in the parameter's _clients map)

better setChanged strategy (the last change would break for parameters shared by several solvers, in a loop)

improved def of 0Metamodel/Loop; moved def of 0Metamodel/Batch to a better place; def OL.isChanged(client); improved OL.show(param); plus clean up

communication to the metamoodel of the Gmsh batch and loop status; OL preprocessors returns the /changed/ status of the client; /changed/ flag of all parameters set to false after a /compute/; param attributes updated (not replaced) by a parameter redefinition; + some clean up