Changes in version 0.1.0                        

  - Rebuilt from scratch on CGAL 6 (Constrained_triangulation_plus_2
    with exact predicates and Delaunay_mesher_2) behind a persistent
    cpp11 handle: lari_new(), lari_add_points(), lari_add_segments(),
    lari_remove_points(), lari_remove_segments(), lari_refine(),
    lari_step(), and the contract tables lari_vertices(),
    lari_triangles(), lari_segments(), lari_depth(), lari_counts().
  - Sizing fields: lari_refine(size = ) takes a function of position or
    a grid giving the local maximum triangle area. The default
    edge-length floor now accounts for the sizing field, so a size
    argument is honoured instead of being capped at the coarse
    input-edge scale when min_edge_length is left at its default.
  - Hull-edge Steiner points created during refinement now get
    attributes interpolated along the nearest hull edge, rather than
    copied from the single nearest vertex (fixes attribute error at map
    scale).
  - lari_triangles() (and lari_tables()) gain a depth_distinct column:
    the constraint depth with a doubled boundary counted once, matching
    cdtr's depth_distinct.
  - lari_tables() and lari_triangulate() now return a one-row report
    with the backend, laridae and CGAL versions, the erase region, the
    edge floor, and the last refinement's unrefined counts.
  - Licence is now GPL (>= 3), as required by CGAL's Mesh_2.
  - CGAL (>= 6.0) and Boost headers are supplied by the CRAN packages
    RcppCGAL and BH via LinkingTo, so no system CGAL is required and the
    compiled code passes R CMD check --as-cran. For development, set
    CGAL_INCLUDE_DIR to build against stock CGAL headers instead (see
    README; that route is not CRAN-clean).
  - Builds on macOS and Windows: CGAL 6's
    Constrained_triangulation_plus_2 includes
    boost/stl_interfaces/iterator_interface.hpp, which BH does not ship,
    so the three Boost.STLInterfaces headers it needs are vendored in
    src/boost-extra (Boost Software License). Linux only built before
    because the system Boost filled the gap. Windows also gets a
    src/Makevars.win.
  - The previous Rcpp/cgalh code is preserved on the legacy-rcpp branch.