Show maintainers after creators in About-dialog

It makes sense to show maintainers after creators in the About-dialog,
do that.

app/dialogs/about-dialog.c

@@ -41,8 +41,11 @@
 #include "gimp-intl.h"
 
 
-/* The first authors are the creators, don't shuffle them */
-#define START_INDEX (G_N_ELEMENTS (creators) - 1 /*NULL*/)
+/* The first authors are the creators and maintainers, don't shuffle
+ * them
+ */
+#define START_INDEX (G_N_ELEMENTS (creators)    - 1 /*NULL*/ + \
+                     G_N_ELEMENTS (maintainers) - 1 /*NULL*/)
 
 
 typedef struct

app/dialogs/authors.xsl

@@ -25,11 +25,21 @@ static const gchar * const creators[] =
 };
 </xsl:text>
 
+<xsl:text>
+static const gchar * const maintainers[] =
+{
+</xsl:text>
+  <xsl:apply-templates select="dc:maintainer" />
+<xsl:text>  NULL
+};
+</xsl:text>
+
 <xsl:text>
 static const gchar * const authors[] =
 {
 </xsl:text>
   <xsl:apply-templates select="dc:creator" />
+  <xsl:apply-templates select="dc:maintainer" />
   <xsl:call-template name="recent-contributor">
     <xsl:with-param name="role" select="'author'"/>
   </xsl:call-template>
@@ -61,6 +71,8 @@ static const gchar * const documenters[] =
   </xsl:template>
 
   <xsl:template match="dc:creator">  "<xsl:apply-templates />",
+</xsl:template>
+  <xsl:template match="dc:maintainer">  "<xsl:apply-templates />",
 </xsl:template>
   <xsl:template match="dc:contributor">  "<xsl:apply-templates />",
 </xsl:template>

authors.xml

@@ -11,6 +11,9 @@
   <creator role="author" last-active="2.2">Spencer Kimball</creator>
   <creator role="author" last-active="1.0">Peter Mattis</creator>
 
+  <maintainer role="author" last-active="2.8">Sven Neumann</maintainer>
+  <maintainer role="author" last-active="2.8">Michael Natterer</maintainer>
+
   <contributor role="author" last-active="1.2">Lauri Alanko</contributor>
   <contributor role="author" last-active="2.8">Fredrik Alströmer</contributor>
   <contributor role="author" last-active="1.2">Shawn Amundson</contributor>
@@ -187,10 +190,8 @@
   <contributor role="author" last-active="1.2">Yukihiro Nakai</contributor>
   <contributor role="author" last-active="1.2">Shuji Narazaki</contributor>
   <contributor role="author" last-active="1.2">Felix Natter</contributor>
-  <contributor role="author" last-active="2.8">Michael Natterer</contributor>
   <contributor role="author" last-active="2.4">David Neary</contributor>
   <contributor role="author" last-active="2.2">David Necas</contributor>
-  <contributor role="author" last-active="2.8">Sven Neumann</contributor>
   <contributor role="author" last-active="2.8">Andreas Neustifter</contributor>
   <contributor role="artist" last-active="2.4">Andreas Nilsson</contributor>
   <contributor role="author" last-active="1.0">Stephen Robert Norris</contributor>