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: Typo in test goes unnoticed.
Solution: Fix the typo. Give error for wrong arguments to cursor().
(partly by Hirohito Higashi) Add a test for cursor().
Problem: searchpos() always starts searching in the first column, which is
not what some people expect. (Brett Stahlman)
Solution: Add the 'z' flag: start at the specified column.
