minor docstring updates
minor
XmlCloth: add support for polymorphism
XmlCloth: bare-body methods should pass the ctx.out_object itself down the serialization pipeline
tweaks for debug-print statements
XmlCloth: log missing handlers
minor
XmlCloth: hold subprot switch until the relevant tag is entered.
move cloth check before polymorphic class replace
some more debug-print beautifications
don't write already-written tag siblings