* Use NIO for FilePath#chmod and IOUtils#mode

* Add tests for NIO mode and chmod implementations

* Add test, remove new method, and update JavaDoc

* Provide system property to use native implementations of chmod and mode

* Revert unrelated whitespace modification

* Don't remove exception from throws and put imports in original location

* Fix broken JavaDoc links

* Ignore file type bits (above 0o7777) in Util#modeToPermission

* Use octal for constants and don't include file type bits

* Revert unnecessary changes to TarArchiverTest

* Add assertion that non-permission bits are ignored by chmod

* Use NIO copy with StandardCopyOption.COPY_ATTRIBUTES in copyToWithPermissions where possible

* Catch InvalidPathException and convert it to IOException

* Create utility method for File#toPath and use File#createDirectories after review

* Remove useless calls to toAbsolutePath and getAbsoluteFile

* Fix typos and use octal for constant after review

* Add test for behavior of copyToWithPermission with special bits