Updates information for tiles after merging two tiles

Uses the information from the shared edge to update the merged PCs, area, number of points, and perimeter. Mutates the e_merge_fromth value within the V_pcs, V_npts, V_perimeter, V_area input data structures.

Usage

update_V_cpp(
  V_pcs,
  V_npts,
  V_perimeter,
  V_area,
  e_merge_from,
  e_merge_to,
  e_merge_edge_length,
  e_merge_area,
  e_merge_npts,
  e_merge_pcs,
  agg_mode
)