General: Work item 16643 - Add file directory as a cache option for cache_to_discISAM git-svn-id: https://phpexcel.svn.codeplex.com/svn/trunk@82024 2327b42d-5241-43d6-9e2a-de5ac946f064
git-svn-id: https://phpexcel.svn.codeplex.com/svn/trunk@59884 2327b42d-5241-43d6-9e2a-de5ac946f064