authors.xml: add Nikc M. and Lionel N.

And regenerate AUTHORS.

AUTHORS

@@ -167,6 +167,7 @@ The following people have contributed code to GIMP:
  Adrian Likins
  Tor Lillqvist
  Ingo Lütkebohle
+ Nikc M.
  Josh MacDonald
  Ed Mackey
  Vidar Madsen
@@ -201,6 +202,7 @@ The following people have contributed code to GIMP:
  Adam D Moss
  Tobias Mueller
  Michael Muré
+ Lionel N.
  Balazs Nagy
  Yukihiro Nakai
  Shuji Narazaki

authors.xml

@@ -185,6 +185,7 @@
   <contributor role="documenter" last-active="2.6">Jean-Pierre Litzler</contributor>
   <contributor role="documenter" last-active="2.6">Vitaly Lomov</contributor>
   <contributor role="author" last-active="1.2">Ingo Lütkebohle</contributor>
+  <contributor role="author" last-active="2.10">Nikc M.</contributor>
   <contributor role="author" last-active="1.0">Josh MacDonald</contributor>
   <contributor role="author documenter" last-active="1.0">Ed Mackey</contributor>
   <contributor role="author" last-active="1.2">Vidar Madsen</contributor>
@@ -219,6 +220,7 @@
   <contributor role="author" last-active="2.4">Adam D Moss</contributor>
   <contributor role="author" last-active="2.8">Tobias Mueller</contributor>
   <contributor role="author" last-active="2.8">Michael Muré</contributor>
+  <contributor role="author" last-active="2.10">Lionel N.</contributor>
   <contributor role="author" last-active="1.2">Balazs Nagy</contributor>
   <contributor role="author" last-active="1.2">Yukihiro Nakai</contributor>
   <contributor role="author" last-active="1.2">Shuji Narazaki</contributor>