Big commit: Added symlink support to the kernel.

- added needed syscalls to access symlink support from userland
- implemented lstat(), symlink(), and readlink()
- added dev_t to ktypes.h (for now - should be in a public header anyway)
- added symlink support to the "ls" command (now calls lstat() and shows the
  link target with the -l option)
- changed the sys_read_stat() call to support symlinks, and updated files
  using that function (it gets an extra argument: bool traverseLink)


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@560 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/posix/dirent.h

@@ -10,7 +10,7 @@
 // This file should reside in headers/posix, not here...
 // needs ino_t (int64), and dev_t (long)
 #include <ktypes.h>
-typedef long dev_t;
+
 
 typedef struct dirent {
 	dev_t			d_dev;