hdf5_ep

[svn-r23171] cmakehdf5 is a build command script similar to buildhdf5.
This has been developed and tested in the trunk branch and is
now made available in the v1.8 branch.

Tested: Linux (Jam), linux 64 (koala), ppc64 (ostrich), Mac (fred, duck and Owl) passed.
Failed in SunOS (linew). Will fix when the new Sun is available.