Problem: Vim can create a directory but not delete it.
Solution: Add an argument to delete() to make it possible to delete a
directory, also recursively.
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: When there is a backslash in an option ":set -=" doesn't work.
Solution: Handle a backslash better. (Jacob Niehus) Add a new test, merge
in old test.
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.
