updated license information

- added COPYING file with GPLv2 text
- distribute COPYING everywhere

MANIFEST.in

 recursive-include debian *
 recursive-include ligo/gracedb/test *
 include ligo-gracedb.spec
+include COPYING

ligo-gracedb.spec

@@ -8,7 +8,7 @@ Name:      %{name}
 Version:   %{version}
 Release:   %{release}%{?dist}
 Source0:   %{name}-%{unmangled_version}.tar.gz
-License:   GPL
+License:   GPLv2+
 Group:     Development/Libraries
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-buildroot
 Prefix:    %{_prefix}
@@ -81,10 +81,12 @@ client tool is provided to submit a candidate event to the database.
 rm -rf $RPM_BUILD_ROOT
 
 %files -n python2-%{name}
+%license COPYING
 %{_bindir}/gracedb
 %{python2_sitelib}/*
 %exclude %{python_sitelib}/ligo/gracedb/*pyo
 
 %files -n python%{python3_pkgversion}-%{name}
+%license COPYING
 %{python3_sitelib}/*
 %exclude %{python3_sitelib}/ligo/gracedb/test/*pyo

setup.cfg

@@ -4,3 +4,6 @@ release = 1
 
 [bdist_wheel]
 universal=1
+
+[metadata]
+license_file = COPYING

setup.py

@@ -43,7 +43,7 @@ setup(
   long_description = "The gravitational wave candidate event database (GraceDB) is a system to organize candidate events from gravitational wave searches and to provide an environment to record information about follow-ups. A simple client tool is provided to submit a candidate event to the database.",
 
   url = "https://wiki.ligo.org/DASWG/GraceDB",
-  license = 'GPL',
+  license = 'GPLv2+',
   namespace_packages = ['ligo'],
   #provides = ['ligo.gracedb'],
   packages = find_packages(),