vchoi_fork

[svn-r6920] Purpose:
    Bug fix

Description:
    (void *)~((size_t)NULL) on the Cray is a different value than
    (foo *)~((size_t)NULL) and causes some of the hyperslab algorithms to
    fail.

Solution:
    Change all the 'void *' forms to 'foo *' forms.

Platforms tested:
    Cray SV1
    h5committest not needed.