Fix #4513: Correct JCalendar LGPL false positive and add regression test

Author: Kaushik-Kumar-CEG

src/licensedcode/data/rules/gpl-2.0-plus_60.RULE

@@ -6,15 +6,15 @@ notes: there are some confusing references to both LGPL and GPL
 ---
 
 This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
+it under the terms of the {{GNU General Public License}} as published by
 the Free Software Foundation; either version 2 of the License, or
 (at your option) any later version.
 
 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
+{{GNU General Public License}} for more details.
 
-You should have received a copy of the GNU Library Public License
+You should have received a copy of the {{GNU Library Public License}}
 along with this program; if not, write to the Free Software
 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

src/licensedcode/data/rules/lgpl-2.0-plus_jcalendar_1.RULE

@@ -0,0 +1,20 @@
+---
+license_expression: lgpl-2.0-plus
+is_license_notice: yes
+relevance: 100
+notes: Matches a common variant where Lesser and version 2 are mixed up
+---
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

tests/licensedcode/data/datadriven/lic1/jcalendar_header.txt

@@ -0,0 +1,13 @@
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

tests/licensedcode/data/datadriven/lic1/jcalendar_header.txt.yml

@@ -0,0 +1,3 @@
+license_expressions:
+  - lgpl-2.0-plus
+