Add release notes for v1.3.0 (#593)

* Add release notes for v1.3.0

* Add v1.3 notes to menu

* Small text changes

* Add note about bug fix

Author: tsmbland

docs/release-notes/index.rst

@@ -6,6 +6,7 @@ This is the list of changes to MUSE between each release.
 .. toctree::
    :maxdepth: 1
 
+   v1.3.0
    v1.2.3
    v1.2.2
    v1.2.1

docs/release-notes/v1.3.0.md

@@ -0,0 +1,48 @@
+# Release notes for MUSE v1.3.0 (December 3, 2024)
+
+## New `timeslice_level` parameter ({github}`550`)
+
+- Users can now specify a timeslice level for each sector using the new `timeslice_level` parameter (for example `timeslice_level = "month"`).
+- This is the level of timeslice granularity over which commodity flows out of a sector are balanced with demand. For example, a user modelling an oil sector may wish to specify that oil supply must match demand on a monthly basis, but not necessarily in every hour (as oil can be stored).
+- See documentation for this parameter [here](https://muse-os.readthedocs.io/en/latest/inputs/toml.html#standard-sectors). More details can also be found at {github}`550`.
+- Note: This supersedes the timeslice aggregation feature in previous versions of MUSE. If you have a `timeslices.aggregates` section in your settings file, this should be deleted, otherwise a warning will be raised.
+
+## Default solver ({github}`587`)
+
+- The default solver has changed to "scipy" (previously "adhoc")
+- If the `lpsolver` field is left blank for any subsector, a warning will be raised and "scipy" will be used. If you wish to use the "adhoc" solver, you __must__ specify `lpsolver = "adhoc"`.
+- Users are encouraged to use the "scipy" solver for all subsectors, unless memory limits are reached (see {github}`389`)
+
+## Added support for Python 3.13 ({github}`564`)
+
+- MUSE now works with Python versions 3.9 to 3.13
+- Python 3.9 reaches its end of life [next year](https://devguide.python.org/versions/), so if you are currently using Python 3.9, now is a good opportunity to upgrade
+
+## Bug fixes
+
+- A major error with the "comfort", "efficiency", "capital_costs" and "ALCOE" objectives has been fixed ({github}`581`).
+- Processing of the `AgentShare` parameter (agents file and technodata files) has changed to enforce consistency between files ({github}`586`). If you receive a new `AgentShareNotDefined` error, please double check that your `AgentShare` names are consistent between your agents and techodata files. See updated documentation [here](https://muse-os.readthedocs.io/en/latest/inputs/technodata.html).
+
+## Deprecated features
+
+### Outputs ({github}`548`)
+
+- The following outputs have been deleted and can no longer be used: "timeslice_supply", "metric_supply", "yearly_supply", "metricy_supply", "timeslice_consumption", "metric_consumption", "yearly_consumption", "metricy_consumption"
+- Any attempt to use these outputs will raise an error
+- If you need detailed supply/consumption data for any sector, please use the "supply" and "consumption" outputs within each sector, for example (replacing `SECTOR_NAME` with the name of the sector):
+
+  ```toml
+  [[sectors.SECTOR_NAME.outputs]]
+  filename = '{cwd}/{default_output_dir}/{Sector}/{Quantity}.csv'
+  quantity = "supply"
+  sink = "aggregate"
+  ```
+
+### Production methods ({github}`557` and {github}`559`)
+
+- The "match" and "costed" options for the `dispatch_production` parameter have been removed
+- Please see [here](https://muse-os.readthedocs.io/en/latest/inputs/toml.html#standard-sectors) for updated documentation on this parameter
+
+### Legacy sectors ({github}`510`)
+
+- Sectors with `type = "legacy"` are no longer compatible