Update HDF5 1.8 copyright headers with updated copyright URL (#148)

* Update URL for COPYING file in copyright headers.

* Make fortran copyright headers uniformly spaced.

* Update url for Copyright file in c++/src/footer.html.

tools/h5diff/dynlib_diff.c

@@ -5,7 +5,7 @@
  * This file is part of HDF5. The full HDF5 copyright notice, including      *
  * terms governing use, modification, and redistribution, is contained in    *
  * the COPYING file, which can be found at the root of the source code       *
- * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
+ * distribution tree, or in https://www.hdfgroup.org/licenses.               *
  * If you do not have access to either file, you may request a copy from     *
  * help@hdfgroup.org.                                                        *
  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */