hdf5

[svn-r27880] Changes to autogen.sh

- Removed the long options, which are not supported under
  the getopts builtin.

- Correctly labeled the autogen.sh script as requiring bash
  (via the #!). We may need to remove the bash constructs
  before the 1.10 release and revert to sh.

- The help output is now correct.

Tested on: local linux