vchoi_fork

[svn-r3010] Purpose:
    Bug fix
Description:
    When the v1.2 compatibility code was turned on, internal functions in the
    library were getting confused.
Solution:
    Separated guts of H5Pget_driver call into an API function (the definition
    of which depends on the compatibility switch) and an internal function
    which always behaves like the v1.3/4 function.  Replaced API function calls
    in the library code with the internal function.
Platforms tested:
    FreeBSD 4.2 (hawkwind)