Ruff: Disallow unsafe fixes and revert changes.

[ioannis-vm]

Issue description

The ruff configuration in pyproject.toml contained preview=true, which enables certain checks (and potential fixes) that are very recent and potentially unstable. I applied some of those fixes in PR #297, instead of simply silencing the lines causing the warnings. This PR is the result of a review of those particular fixes.

Steps taken

1. I identified all ruff rules currently "in preview" that have automated fixes from the ruff documentation.
2. I checked out the original commit where I started applying fixes (9423954) and isolated all ruff warnings related to those specific rules.
3. I removed duplicates, resulting in the following set of warnings:

+ E226 [*] Missing whitespace around arithmetic operator
+ FURB171 [*] Membership test against single-item container
+ E266 [*] Too many leading `#` before block comment
+ E265 [*] Block comment should start with `# `
+ PLR1730 [*] Replace `if` statement with `McMy = max(McMy, 1.0)`
+ PLR1730 [*] Replace `if` statement with `McMy = min(McMy, 1.3)`
+ PLR1730 [*] Replace `if` statement with `Cpr = min(1.2, Cpr)`
+ PLR1730 [*] Replace `if` statement with `ro_req = max(ro_req, ro_min_b)`
+ PLR1730 [*] Replace `if` statement with `maxDriftPiso = max(maxDriftPiso, drift_piso)`
+ E231 [*] Missing whitespace after ','
+ E262 [*] Inline comment should start with `# `
+ PLR1730 [*] Replace `if` statement with `max` call
+ FURB152 [*] Replace `3.14` with `math.pi`
+ PLR1730 [*] Replace `if` statement with `tank_level = max(tank_level, 0)`
+ PLR1730 [*] Replace `if` statement with `tank_level = max(tank_level, cur_node.min_level)`
+ PLR1730 [*] Replace `if` statement with `min_step_time = min(min_step_time, time_step)`
+ PLR1730 [*] Replace `if` statement with `av_r = min(av_r, 1)`
- FURB140 [*] Use `itertools.starmap` instead of the generator
- PLR0203 [*] Static method defined without decorator

4. I applied those fixes on a disposable branch to get diffs.
5. I inspected the diffs. All fixes in the above block marked with + appear appropriate. For the last two marked with a - I wasn't sure if they were causing a breaking check (nor did I check), so I marked the changes for reversal.
6. I created a branch starting from the latest master branch and manually reverted the potentially unsafe changes.
7. Most importantly, I updated the pyproject.toml configuration file to disable automatic fixes for rules with preview status.

A PR will follow with updates to the codespell configuration.

[ioannis-vm]

Note

PR #304 takes care of the spell-checking workflow.