copy over 2.4.1 and 2.4.2 release notes

git-svn-id: http://svn.osgeo.org/postgis/trunk@16184 b70326c6-7e19-0410-871a-916f4a2858ee

doc/release_notes.xml

@@ -3,7 +3,41 @@
   <title>Appendix</title>
     <subtitle>Release Notes</subtitle>
 
+   <sect1>
+      <title>Release 2.4.2</title>
+      <para>Release date: 2017/11/15</para>
+      <para>This is a bug fix and performance improvement release.</para>
+      <simplesect>
+        <title>Bug Fixes and Enhancements</title>
+        <para>#3917, Fix zcta5 load</para>
+        <para>#3667, Fix for bug in geography ST_Segmentize</para>
+        <para>#3926, Add missing 2.2.6 and 2.3.4 upgrade paths (Muhammad Usama)</para>
+      </simplesect>
+    </sect1>
 
+    <sect1>
+      <title>Release 2.4.1</title>
+      <para>Release date: 2017/10/18</para>
+      <para>This is a bug fix and performance improvement release.</para>
+      <simplesect>
+        <title>Bug Fixes and Enhancements</title>
+        <para>#3864, Fix memory leaks in BTREE operators</para>
+        <para>#3869, Fix build with "gold" linker</para>
+        <para>#3845, Gracefully handle short-measure issue</para>
+        <para>#3871, Performance tweak for geometry cmp function</para>
+        <para>#3879, Division by zero in some arc cases</para>
+        <para>#3878, Single defn of signum in header</para>
+        <para>#3880, Undefined behaviour in TYPMOD_GET_SRID</para>
+        <para>#3875, Fix undefined behaviour in shift operation</para>
+        <para>#3864, Performance improvements for b-tree geometry sorts</para>
+        <para>#3874, lw_dist2d_pt_arc division by zero</para>
+        <para>#3882, undefined behaviour in zigzag with negative inputs</para>
+        <para>#3891, undefined behaviour in pointarray_to_encoded_polyline</para>
+        <para>#3895, throw error on malformed WKB input</para>
+        <para>#3886, fix rare missing boxes in geometry subdivision</para>
+        <para>#3907, Allocate enough space for all possible GBOX string outputs (Raúl Marín Rodríguez)</para>
+      </simplesect>
+    </sect1>
     <sect1>
         <title>Release 2.4.0</title>
         <para>Release date: 2017/09/30</para>