ENH: Create a generic XdmfVisitor class and move writing operations to...
ENH: Create a generic XdmfVisitor class and move writing operations to XdmfWriter. Incorporate Loki library to perform asymmetric visitor operation (allows customizable behavior for eventual Xdmf / NetDMF library split). Modify Loki Visitor to work happily with boost::shared_ptr and modify swig wrapping to properly handle boost::shared_ptr inheritance.
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