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: Some terminals misinterpret the code for getting cursor style.
Solution: Send a sequence to the terminal and check the result. (IWAMOTO
Kouichi, closes#2126) Merged with current code.
Problem: Tests using term_wait() can still be flaky.
Solution: Increase the wait time when rerunning a test. (James McCoy,
closes#5899) Halve the initial times to make tests run faster
when there is no rerun.
Problem: Cannot detect encoding in a fifo.
Solution: Extend the stdin way of detecting encoding to fifo. Add a test
for detecting encoding on stdin and fifo. (Ken Takata)
