Managing files and directories

[mrsmkl]

Some of these might be easy to implement, but directory handling might be complex.
9. Link (not implemented?)
10. Unlink (remove files?)
12. Chdir, perhaps need something for keeping track of current directory, it will be similar to command line arguments
38. Rename
39. Mkdir: how to implement directories?
40. Rmdir
83. Symlink: how to handle?
133. Fchdir
183. Getcwd
220. Getdents
296. Mkdirat
301. Unlinkat
302. Renameat
304. Symlinkat