working on smart ranges

Readme.md

src/polymesh/algorithms/properties.hh

src/polymesh/attributes.hh

src/polymesh/cursors.hh

src/polymesh/impl/impl_attributes.hh

src/polymesh/impl/impl_cursors.hh

src/polymesh/impl/impl_ranges.hh

src/polymesh/ranges.hh

src/polymesh/tmp.hh