Problem:    MS-Windows: build failure with MSVC.
Solution:   Adjust the list of distributed files.  Add hint about python.
            Adjust path for reading runtime files.

Problem:    Various comments can be improved.
Solution:   Various comment adjustments.

Problem:    When using valgrind a Vim command started by a test uses the same
            log file name which gets overwritten.
Solution:   Fix regexp to rename the log file.

Problem:    Not enough testing for Python.
Solution:   Add more tests.  Fix uncovered problems. (Yegappan Lakshmanan,
            closes #6392)

Problem:    Netbeans test sometimes fails.
Solution:   Mark any test using an external command as flaky.

Problem:    Ruby test fails on MS-Windows.
Solution:   Remove the "maintainer" line. (Ken Takata, closes #6015)

Problem:    various code is not properly tested.
Solution:   Add more tests. (Yegappan Lakshmanan, closes #5871)

Problem:    Tests fail when the float feature is disabled.
Solution:   Skip tests that don't work without float support.

Problem:    Typos and other small things.
Solution:   Small fixes.

Problem:    Some tests fail when run as root.
Solution:   Add CheckNotRoot and use it. (James McCoy, closes #5020)