Adds the given paths to the svn:ignore properties of their parents,
if they are not already there.
(If a given path contains a wildcard character (*, ?, [, or \), the
results are undefined specifically, the result of the check to see
if the entry is already there may not be what you expected. Currently
it will not try to escape any such entries before adding them.)
To tell svk to start paying attention to a file again, use the command
svk pe svn:ignore to manually edit the ignore list.