perglue.cpp - use static_cast instead of dynamic_cast if possible,

use switch instead of plenty of ifs,
export clone<DynamicPrintConfig> to Perl XS.

xs/xsp/typemap.xspt

@@ -39,6 +39,7 @@
 %typemap{Clone<BoundingBoxf3>}{simple};
 %typemap{DynamicPrintConfig*};
 %typemap{Ref<DynamicPrintConfig>}{simple};
+%typemap{Clone<DynamicPrintConfig>}{simple};
 %typemap{StaticPrintConfig*};
 %typemap{Ref<StaticPrintConfig>}{simple};
 %typemap{PrintObjectConfig*};