implement its locking scheme, this module implements a crude link() by
way of copying the source to the destination provided the destination
doesn't already exist.

record tuple by name as well as index, to match the behaviour of
the pwd/grp extension modules for Unix.  These emulation modules
now pass test_pwd & test_grp.

  Lib/plat-os2emx/
    IN.py
    SOCKET.py
    grp.py
    pwd.py       // pwd module that can process real passwd files
    regen