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: Tests do not run or are not reliable on some systems.
Solution: Use "findstr" instead of "grep" on MS-Windows. Clear
PROMPT_COMMAND in the terminal test. Delete temp file. Wait for
output after executing a debug command. (Yegappan Lakshmanan,
closes#4479)