add extern "C" to iterator.h

add extern "C" to properties.h

add test coverage for unlinking tree nodes w/o prev pointer

add max depth for tree search - closes #459

fix totally bugged assertion in cxPropertiesUseStack()

add source/sink facility for properties - fixes #430

fix missing parameter doc

fix several survivors of east-const and some missing consts

fix invalid reads when removing linked list nodes

add implementation for the properties parser

add ucx2.1 style interface for a properties parser

also report coverage for header files

make loc_prev in trees optional - fixes #433

update CHANGELOG

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