RewriteVisitor class for source-to-source transformation

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>> * New baseclass "RewriteVisitor" whose default implementation clones a
>> PTree (file RewriteVisitor.h). I use this base class for all the
>> visitors that perform source-to-source transformation.
>>
>
> Can you describe in what way the existing Visitor base class isn't generic
> enough for your needs ?
>

The RewriteVisitor inherits from the existing Visitor base class. Its
implementation simply clone the visited PTree, without loosing the
type of the PTree::Nodes:

PTree* clone(PTree* tree) {return RewriteVisitor().rewrite(tree);}

In order to perform source-to-source transformation, I inherit from
RewriteVisitor and override only the visit functions corresponding to
the nodes that have to be rewritten differently.

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