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Fixing nasty behavior when debugging exceptions.

-Switch wasn't updating thr current_process

-We need to raise the debugger right on the spot of the offending
 expression, not on the next expression to be evaluated.

-If the first command of the debugger is "continue", we interpret it as
 "raise the exception". The propagating exception should not stop
 somewhere in the path and call the debugger again.
Prompting for superclass when adding a class in ME
Fixed dom query for class fields
Added 'Reset' command for ModuleExplorer
s/Module instantiated/Module loaded/
Added shortcut to inspect active ModuleExplorer
Fixing WebPluginFactory bug when using multiple ME instances
Improved substantially the tutorial