Kintyre / ksconf / 101

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Resolved 'unclosed file' warnings

All changes were to resolve this warning message:

    ResourceWarning: unclosed file <_io.BufferedReader name='.../bogus.conf'>

- Refactored parse_conf(), write_conf() into separate file+stream and stream-
  only (backend) functions so that all file open requests are properly handed
  in a 'with' block.
- Improved file handling of the TestWorkDir and other unit-testing helpers
- Re-enabled the test_sort_inplace_returncode() test which was failing due to
  the ResourceWarning messages written to stderr.

38 of 38 new or added lines in 4 files covered. (100.0%)

2445 of 3073 relevant lines covered (79.56%)

2.71 hits per line