Update terms of use to agree with current NIST language
Terms of Use
------------
-This software was developed at the `National Institute of Standards
-and Technology`_ by employees of the Federal Government in the course
-of their official duties. Pursuant to `title 17 section 105`_ of the
-United States Code this software is not subject to copyright
-protection and is in the public domain. FiPy is an experimental
-system. NIST_ assumes no responsibility whatsoever for its use by
-other parties, and makes no guarantees, expressed or implied, about
-its quality, reliability, or any other characteristic. We would
-appreciate acknowledgement if the software is used.
-
-This software can be redistributed and/or modified freely
-provided that any derivative works bear some notice that they are
-derived from it, and any modified versions bear some notice that
-they have been modified.
+This software was developed by employees of the `National Institute of
+Standards and Technology`_ (NIST_), an agency of the Federal Government and
+is being made available as a public service. Pursuant to `title 17 United
+States Code Section 105`_, works of NIST_ employees are not subject to
+copyright protection in the United States. This software may be subject to
+foreign copyright. Permission in the United States and in foreign
+countries, to the extent that NIST_ may hold copyright, to use, copy,
+modify, create derivative works, and distribute this software and its
+documentation without fee is hereby granted on a non-exclusive basis,
+provided that this notice and disclaimer of warranty appears in all copies.
+THE SOFTWARE IS PROVIDED 'AS IS' WITHOUT ANY WARRANTY OF ANY KIND, EITHER
+EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, ANY
+WARRANTY THAT THE SOFTWARE WILL CONFORM TO SPECIFICATIONS, ANY IMPLIED
+WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
+FREEDOM FROM INFRINGEMENT, AND ANY WARRANTY THAT THE DOCUMENTATION WILL
+CONFORM TO THE SOFTWARE, OR ANY WARRANTY THAT THE SOFTWARE WILL BE ERROR
+FREE. IN NO EVENT SHALL NIST BE LIABLE FOR ANY DAMAGES, INCLUDING, BUT NOT
+LIMITED TO, DIRECT, INDIRECT, SPECIAL OR CONSEQUENTIAL DAMAGES, ARISING OUT
+OF, RESULTING FROM, OR IN ANY WAY CONNECTED WITH THIS SOFTWARE, WHETHER OR
+NOT BASED UPON WARRANTY, CONTRACT, TORT, OR OTHERWISE, WHETHER OR NOT
+INJURY WAS SUSTAINED BY PERSONS OR PROPERTY OR OTHERWISE, AND WHETHER OR
+NOT LOSS WAS SUSTAINED FROM, OR AROSE OUT OF THE RESULTS OF, OR USE OF, THE
+SOFTWARE OR SERVICES PROVIDED HEREUNDER.
.. _National Institute of Standards and Technology: http://www.nist.gov/
.. _NIST: http://www.nist.gov/
-.. _title 17 section 105: http://uscode.house.gov/uscode-cgi/fastweb.exe?getdoc+uscview+t17t20+9+0++
+.. _title 17 United States Code Section 105: https://www.copyright.gov/title17/92chap1.html#105
