material property, list-constructor

git-svn-id: http://svn.code.sf.net/p/netgen-mesher/code/netgen@840 38e36fca-e102-11dd-b6c5-65a6809f2f0c
mp with named args in constructor

git-svn-id: http://svn.code.sf.net/p/netgen-mesher/code/netgen@841 38e36fca-e102-11dd-b6c5-65a6809f2f0c