Description:
    Revert r25273, 25283 & 25439 (the hyperslab improvement changes).  They
are buggy and it's taking me a long time to correct the problem.  I'll check
in a revised form of the changes when I've got them straightened out.

Tested on:
    Mac OSX 10.10.0 (amazon) w/gcc 4.9.x, C++, FORTRAN
    Linux 2.6.x (jam) w/parallel


git-svn-id: https://svn.hdfgroup.uiuc.edu/hdf5/trunk@25766 dab4d1a6-ed17-0410-a064-d1ae371a2980