* [FILE_EXT,EXT] directory_files/3 no longer includes '.' and '..' in the results.
* [FILE_EXT,NEW] Added directory_files2/2 which uses directory_files/2 (library filesex) but does not include '.' and '..' in the results.
* [FILE_EXT,EXT] file_name_type/3 can now cope with type 'directory'.
* [LATEX_EXT,EXT] Allow directories to be traversed recursively with latex_convert_directory/[1,2].