Aider v0.40.0

• Improved prompting to discourage Sonnet from wasting tokens emitting unchanging code (#705).
• Improved error info for token limit errors.
• Options to suppress adding "(aider)" to the git author and committer names.
• Use --model-settings-file to customize per-model settings, like use of repo-map (by @caseymcc).
• Improved invocation of flake8 linter for python code.