New API calls: lstatlist, lxattrlist, readlinklist.

New API calls: lstatlist, lxattrlist, readlinklist.

These three functions are very specifically designed for FUSE
support, so we can list directories efficiently.  Instead of
making lots of lstat, lgetxattr and readlink calls, we can make just
three calls per directory to grab all the attributes (which we
then cache briefly).