Merge branch 'branch-1.2' of ssh://git.gag.com/scm/git/fw/altos into branch-1.2

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+<?xml version="1.0" encoding="utf-8" ?>
+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+"/usr/share/xml/docbook/schema/dtd/4.5/docbookx.dtd">
+
+<article>
+  <para>
+    Version 1.2.1 is a minor release. It adds support for TeleBT and
+    the AltosDroid application, provides several new features in
+    AltosUI and fixes some bugs in the AltOS firmware.
+  </para>
+  <para>
+    AltOS Firmware Changes
+    <itemizedlist>
+      <listitem>
+	Add support for TeleBT
+      </listitem>
+      <listitem>
+	In TeleMini recovery mode (when booted with the outer two
+	debug pins connected together), the radio parameters are also
+	set back to defaults (434.550MHz, N0CALL, factory radio cal).
+      </listitem>
+      <listitem>
+	Add support for reflashing the SkyTraq GPS chips. This
+	requires special host-side code which currently only exists
+	for Linux.
+      </listitem>
+      <listitem>
+	Correct Kalman filter model error covariance matrix. The
+	values used previously assumed continuous measurements instead
+	of discrete measurements.
+      </listitem>
+      <listitem>
+	Fix some bugs in the USB driver for TeleMetrum and TeleDongle
+	that affected Windows users.
+      </listitem>
+      <listitem>
+	Adjusted the automatic gain control parameters that affect
+	receive performance for TeleDongle. Field tests indicate that this
+	may improve receive performance somewhat.
+      </listitem>
+    </itemizedlist>
+  </para>
+  <para>
+    AltosUI Changes
+    <itemizedlist>
+      <listitem>
+	Handle missing GPS lock in 'Descent' tab. Previously, if the
+	GPS position of the pad was unknown, an exception would be
+	raised, breaking the Descent tab contents.
+      </listitem>
+      <listitem>
+	Improve the graph, adding tool-tips to show values near the
+	cursor and making the displayed set of values configurable,
+	adding all of the flight data as options while leaving the
+	default settings alone so that the graph starts by showing
+	height, speed and acceleration.
+      </listitem>
+      <listitem>
+	Make the initial position of the AltosUI top level window
+	configurable. Along with this change, the other windows will
+	pop up at 'sensible' places now, instead of on top of one
+	another.
+      </listitem>
+      <listitem>
+	Add callsign to Monitor idle window and connecting
+	dialogs. This makes it clear which callsign is being used so
+	that the operator will be aware that it must match the flight
+	computer value or no communication will work.
+      </listitem>
+      <listitem>
+	When downloading flight data, display the block number so that
+	the user has some sense of progress. Unfortunately, we don't
+	know how many blocks will need to be downloaded, but at least
+	it isn't just sitting there doing nothing for a long time.
+      </listitem>
+      <listitem>
+	Add GPS data and a map to the graph window. This lets you see
+	a complete summary of the flight without needing to 'replay'
+	the whole thing.
+      </listitem>
+    </itemizedlist>
+  </para>
+</article>