Add avltree, hashtable, print, other functions to be used in pseudofs.
Also add some global variables to be used in pseudofs.
nfs4_ExportToPseudoFS() updated for new pseudofs avltree/hashtable.
nfs4_CurrentFHToPseudo() updated for new pseudofs avltree/hashtable
nfs4_PseudoToFhandle() updated for new pseudofs avltree/hashtable
nfs4_op_lookup_pseudo() updated for new pseudofs avltree/hashtable
nfs4_op_lookupp_pseudo_by_exp() updated for new pseudofs avltree/hashtable
nfs4_op_readdir_pseudo() updated for new pseudofs avltree/hashtable