update copyright (#1692)

* update copyright

* Update LICENSE

remove current year

* Update LICENSE

* edit AUTHORS

* restate copyholders and order

* put PVLIB python Developers back

* update authors

* consistency

AUTHORS.md

@@ -1,17 +1,19 @@
 About the Copyright Holders
 ===========================
 
-*   Copyright (c) 2013, Sandia National Laboratories
+*   Copyright (c) 2023 pvlib python Contributors
+*   Copyright (c) 2014 PVLIB python Development Team
+*   Copyright (c) 2013 Sandia National Laboratories
 
-    Sandia National Laboratories developed pvlib python based on code in
-    PVLib MATLAB.
+    The pvlib python Contributors comprises all authors of content of the pvlib python project.
+    A complete list of contributors can be found in the documentation.
 
-*   Copyright (c) 2014-2018, pvlib python Development Team
+    The PVLIB python Development Team is the collection of developers of the
+    pvlib python project. Members of this team are included in the pvlib python Contributors.
 
-    The pvlib python Development Team is the collection of developers of the
-    pvlib python project.
+    Sandia National Laboratories originally developed pvlib python based on code in
+    PVLib MATLAB.
 
-Full credits for pvlib python contributors can be found in the documentation.
 
 Our Copyright Policy
 ====================
@@ -21,10 +23,11 @@ over their contributions to pvlib python. However, it is important to note that
 these contributions are typically only changes to the repositories. Thus,
 the pvlib python source code, in its entirety, is not the copyright of any single
 person or institution. Instead, it is the collective copyright of the
-entire pvlib python Development Team. If individual contributors want to maintain
-a record of what changes/contributions they have specific copyright on,
-they should indicate their copyright in the commit message of the change
-when they commit the change to the pvlib python repository.
+Contributors. If individual contributors want to make explicit their copyright
+of the contributions they have made,
+they should indicate their copyright using in-line comments in the code submitted
+to the pvlib python repository, with the understanding that by contributing, they
+grant the pvlib-python license.
 
 License
 =======

LICENSE

@@ -1,6 +1,9 @@
 BSD 3-Clause License
 
-Copyright (c) 2013-2021, Sandia National Laboratories and pvlib python Development Team
+Copyright (c) 2023 pvlib python Contributors
+Copyright (c) 2014 PVLIB python Development Team
+Copyright (c) 2013 Sandia National Laboratories
+
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without modification,
@@ -13,7 +16,7 @@ are permitted provided that the following conditions are met:
   list of conditions and the following disclaimer in the documentation and/or
   other materials provided with the distribution.
 
-  Neither the name of the {organization} nor the names of its
+  Neither the name of the copyright holder nor the names of its
   contributors may be used to endorse or promote products derived from
   this software without specific prior written permission.