For easier testing of PyThermostat code in the development shell, so
that the following is possible right in the repo root:
```
$ python -m pythermostat.plot
Channel 0 target temperature: 25.000
$ python
Python 3.11.9 (main, Apr 2 2024, 08:25:04) [GCC 13.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from pythermostat.client import Client
>>> c = Client()
>>> c
<pythermostat.client.Client object at 0x7f9a41cab190>
>>>
```
Pytec is a misnomer, as the Thermostat is not limited to just
controlling TEC modules. The library also interfaces with and controls
the Thermostat itself, and not the TEC module directly.
See M-Labs/thermostat#149 (comment)
Follow ARTIQ, and in this project lets us include the version number
directly in flake.nix instead of linking to the toml file of a specific
release date, as we use stable Rust.
Also, from nixpkgs manual:
both oxalica's overlay and fenix better integrate with nix and cache
optimizations. Because of this and ergonomics, either of those
community projects should be preferred to the Mozilla's Rust overlay
(nixpkgs-mozilla).
