Add possibility to use multiselect as simple select

[freddidierRTE]

In opfab.js , add a configuration option to act as simple select (option multiple set to false in virtual select)

Change init function signature to :

init : function(config) , config having the following structure :

{
id : string 
options : array of values  
multiple : boolean 
}

Modify documentation accordingly

Use the component in process example :