new release notes page

wiki/ReleaseNotes.wiki

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+#summary Changelog and notes about CORE releases.
+
+= 4.1 =
+CORE 4.1 was released on 1/??/10.
+
+The high-level changes since version 4.0 are:
+ * new icons for toolbars and nodes
+ * node services introduced, node models deprecated
+ * customizable node types
+ * traffic flow editor with MGEN support
+ * user configs moved from /etc/core/`*` to ~/.core/
+ * allocate addresses from custom IPv4/IPv6 prefixes
+ * distributed emulation using GRE tunnels
+ * FreeBSD 8.1 now uses cored.py
+ * EMANE 0.6.4 support
+ * numerous bugfixes
+
+
+= 4.0 =
+CORE 4.0 was released on 8/17/10.
+
+Here are some of the high-level changes since version 3.5:
+ * Python framework with Linux network namespace (netns) support (Linux netns is now the primary supported platform)
+ * ability to close the GUI and later reconnect to a running session (netns only)
+ * EMANE integration (netns only)
+ * new topology generators, host file generator
+ * user-editable Observer Widgets
+ * use of /etc/core instead of /usr/local/etc/core
+ * various bugfixes
+
+Link to [http://pf.itd.nrl.navy.mil/pipermail/core-users/2010-August/000209.html 4.0 release announcement].
+
+= 3.5 =
+
+= 3.4 =