vfs: added pseudofs with permission checking
nfs: use Set to manage exports
nfs: use FsExport per client entry
nfs: ExportFile accepts URL in the constructor
nfs: FileSystem should be able to get inode by ID and provide inode ID
nfs: encode/decode file handle with NFS extentions
pseudofs: rename access to checkAccess
vfs: move setattr/getattr from inode into FileSystem interface
vfs: introduce Stat class to replace one from chimera
vfs: move set/getacl into file system interface
vfs: move type() from Inode to Stat
vfs: compute fileid from device id + ino
vfs: get rid of exists() in Inode
vfs: embed FileHandle into Inode
nfs: allow atomic update of export file
nfs4: fix initial permission for newly created file system object
vfs: make Stat#fileid a field.
nfs4: client: added getattr command
vfs: update PseudoFs to do lookups in export file
pseudofs: respect RO exports