clufs-0.1 released

Initial version of clufs released. The release contains initial implementation of directory and file creation. Files can opened for reading and writing.

Sample session:

(in-package :cl-user)

(clufs:mkfs "test.clufs")
(let ((clufs (clufs:mount "test.clufs")))
(clufs:mkdir clufs '(my-test-dir))
(clufs:create clufs '(my-test-dir file))
(let ((stream (clufs:open clufs '(my-test-dir file))))
(prin1 "Hello World!" stream)
(clufs:sync clufs)
(file-position stream 0)
(read stream)))
; => "Hello World!"