Problem: Various inconsistencies in test files.
Solution: Add modelines where they were missing. Use Check commands instead
of silently skipping over tests. Adjust indents and comments.
(Ken Takata, closes#6695)
Problem: assert_fails() checks the last error message.
Solution: Check the first error, it is more relevant. Fix all the tests
that rely on the old behavior.
Problem: Window size wrong if 'ea' is off and 'splitright' is on and
splitting then closing a window.
Solution: Put abandoned window space in the right place. (Mark Waggoner)
Problem: Height of quickfix window not retained with vertical split.
Solution: Use frame_fixed_height() and frame_fixed_width(). (Hongbo Liu,
closes#4013, closes#2998)
Problem: Still quite a few old style tests.
Solution: Convert old to new style tests. (Yegappan Lakshmanan)
Avoid ringing the bell while running tests.
