Add subheadings to doc/whatsnew “Next release”

doc/whatsnew.rst

@@ -4,29 +4,52 @@ What's new
 Next release
 ============
 
-- Introduce an SSP configuration for cooling technologies with share constraints (:pull:`256`).
 - :mod:`message_ix_models` is tested and compatible with `Python 3.13 <https://www.python.org/downloads/release/python-3130/>`__ (:pull:`250`).
 - Support for Python 3.8 is dropped (:pull:`250`), as it has reached end-of-life.
-- Connect the water module to the cost module for cooling technologies (:pull:`245`).
-- Make setup of constraints for cooling technologies flexible and update solar csp tech. name (:pull:`242`).
-- Fix the nexus/cooling function and add test for checking some input data (:pull:`236`).
-- Add :doc:`/project/circeular` project code and documentation (:pull:`232`).
-- Update water availability data and major code editing to allow a new test suite for the water module (:pull:`106`).
 - Expand :doc:`repro` with sections on :ref:`repro-doc` and :ref:`versioning`, including :ref:`a list of external model names and ‘versions’ <model-names>` like “MESSAGEix-GLOBIOM 2.0” (:issue:`224`, :pull:`226`).
-- Update :doc:`/transport/index` (:pull:`213`).
-- Add "LED", "SSP4", and "SSP5" as values for the :program:`--ssp=…` option in :func:`.common_params` (:pull:`233`).
-- Fix and update :doc:`/api/tools-costs` (:pull:`219`, :pull:`206`, :pull:`221`, :pull:`227`, :pull:`222`)
-
-  - Fix naming of GDP and population columns in SSP data aggregation (:pull:`219`).
-  - Edit inputs for storage, CSP, hydrogen, and industry technologies (:pull:`206`).
-  - Replace solar and wind technologies with new ones (:pull:`206`).
-  - Reorganize input files and incorporate `first_year.csv` data into `tech_map.csv` (:pull:`221`).
-  - Reconfigure use and implementation of technology variants/modules to be more agnostic (:pull:`221`).
-  - Change cost decay to reach reduction percentage specified on the year 2100 (:pull:`227`).
-  - Add `cooling` technology variant/module (:pull:`222`).
+
+By topic:
+
+.. contents::
+   :local:
+   :backlinks: none
+
+Materials
+---------
+
 - Improve and extend :doc:`/material/index` (:pull:`218`, :pull:`253`).
+- Release of MESSAGEix-Materials 1.1.0 (:doc:`/material/v1.1.0`).
+
+Transport
+---------
 
-  - Release of MESSAGEix-Materials 1.1.0 (:doc:`/material/v1.1.0`).
+- Update :doc:`/transport/index` (:pull:`213`).
+
+Water/Nexus
+-----------
+
+- Update water availability data and major code editing to allow a new test suite for doc:`/water/index` (:pull:`106`).
+- Fix the nexus/cooling function and add test for checking some input data (:pull:`236`).
+- Make setup of constraints for cooling technologies flexible and update solar CSP technology name (:pull:`242`).
+- Connect :mod:`.model.water` to :mod:`.tools.costs` for cooling technologies (:pull:`245`).
+- Introduce an SSP configuration for cooling technologies with share constraints (:pull:`256`).
+
+Investment and fixed costs
+--------------------------
+
+- Fix naming of GDP and population columns in SSP data aggregation for :doc:`/api/tools-costs` (:pull:`219`).
+- Edit inputs for storage, CSP, hydrogen, and industry technologies (:pull:`206`).
+- Replace solar and wind technologies with new ones (:pull:`206`).
+- Reorganize input files and incorporate `first_year.csv` data into `tech_map.csv` (:pull:`221`).
+- Reconfigure use and implementation of technology variants/modules to be more agnostic (:pull:`221`).
+- Change cost decay to reach reduction percentage specified on the year 2100 (:pull:`227`).
+- Add `cooling` technology variant/module (:pull:`222`).
+
+Others
+------
+
+- Add "LED", "SSP4", and "SSP5" as values for the :program:`--ssp=…` option in :func:`.common_params` (:pull:`233`).
+- Add :doc:`/project/circeular` project code and documentation (:pull:`232`).
 
 v2024.8.6
 =========