gvle: add a duplicate value function

A duplicate item has been added to the contextual menu of the values
list of the condition editor dialog window.
gvle: add another duplicate value function

A duplicate item has been added to the menu of Set or Map editor.
gvle: add a duplicate port parameter function

A duplicate item has been added to the contextual menu of the port
parameter list of the condition editor dialog window.
gvle: add a New menu item to the Dynamics list

When configuring the dynamic of a model by specifying a new model, the
necessary modeling plugin dialog can be directly called. This can be
done by selecting the New item of the contextual menu of the dynamics
tab of the AtomicModelBox Dialog.
Merge pull request #51 from Chabrier/master

gvle: add features and improvment