Problem: :let-heredoc does not trim enough.
Solution: Trim indent from the contents based on the indent of the first
line. Use let-heredoc in more tests.
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)
