v0.2.0 — NetworkX river networks and GRASS modernization

First release since 2017. It modernizes the toolkit for current GRASS GIS and
adds NetworkX-based river-network analysis, developed in collaboration with
Fergus McNab (GFZ Potsdam) and presented at AGU 2025:

Wickert, A. D., and F. McNab (2025), Simulating Geomorphic Evolution Through
River Networks, EP23D-1702, AGU Fall Meeting, New Orleans, LA, USA.

The API is still pre-1.0 and may change.

Added

• v.stream.networkx — a new module that builds a NetworkX
  directed graph of a river network, samples elevation and flow accumulation
  along each segment, computes cumulative distance upstream of the outlet by a
  breadth-first sweep, and optionally exports the graph as JSON. Ships with a
  Makefile and HTML manual page so it installs as a GRASS addon.
• examples/clean_coarsen_network.py — a post-processing ("stage 2") script
  that despikes, smooths, and coarsens a v.stream.networkx JSON export for use
  as input to a downstream long-profile model such as GRLP.
• LICENSE (GNU GPL v3 or later), CITATION.cff, a project README, and
  this CHANGELOG.

Changed

• v.stream.profiler reworked and modernized for current GRASS GIS; adopts
  Pandas; produces river long profiles and slope–accumulation (e.g., slope–area)
  outputs.
• v.stream.network updated for current GRASS GIS; GRASS+NumPy raster reads
  modernized to a single step; tostream enforced as integer; the off-map
  outlet segment is coded as 0.

Removed

• Legacy scripts outside the fluvial-profiler scope (PRMS/MODFLOW/GSFLOW grid and
  parameter builders, an older standalone network extractor, and assorted one-off
  utilities). Standalone, multicore, and other Python-2 development scripts were
  moved to archive/.

Full changelog: v0.1.0...v0.2.0