Fix bug 83

[mshafer-NI]

Fix #83

Fix issue where non-aggressive was moving comments off the correct line (affecting test)

• Wrote a failing test that showed error
• Fix parameters to second call (for --aggressive) to _acknowledge_existing_errors.acknowledge_lint_errors
• extract formatting imports to _fix._format_imports
• Create:
  • _utils.temp_file.multi_access_tempfile to simplify working on imports section alone
  • _utils.code_analysis.find_import_region to simplify identifying the imports section
• Re-work _fix._format_imports to use these to take take only the import/docstring lines at the start of the file and condense them.
• Test now passes