Add options for KML and NMEA formats.

diff --git a/xmldoc/formats/options/kml-extrude.xml b/xmldoc/formats/options/kml-extrude.xml
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+<para>
+This option is a boolean flag to specicy whether Google Earth should
+draw lines from trackpoints to the ground.   It defaults to '0', which
+means no extrusion lines are drawn.   The option of '1' is, of course,
+most useful for points that aren't actually on the ground such as those
+be captured from planes.
+</para>

diff --git a/xmldoc/formats/options/kml-trackdata.xml b/xmldoc/formats/options/kml-trackdata.xml
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+++ b/xmldoc/formats/options/kml-trackdata.xml
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+<para>
+This is a boolean flag that controls
+whether GPSBabel writes extensive data for each trackpoint generated.
+By default computed speed, timestamps, and so on are written with the default
+of '1' for this option.   If you are writing large tracks and do not value
+this information, you can reduce the size of the generated file substantially
+by turning this flag off by setting it to '0'.
+</para>

diff --git a/xmldoc/formats/options/kml-units.xml b/xmldoc/formats/options/kml-units.xml
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+++ b/xmldoc/formats/options/kml-units.xml
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+<para>
+Units is a simple option.  Specify 's' for "statute" (miles, feet, and 
+other things that don't sensibly convert to each other, but are craved
+by Americans) or 'm' for "metric".
+</para>

diff --git a/xmldoc/formats/options/nmea-baud.xml b/xmldoc/formats/options/nmea-baud.xml
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+++ b/xmldoc/formats/options/nmea-baud.xml
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+<para>
+To the "nmea" module, the "baud" option specifies the baud rate of the
+serial connection when used with the real-time tracking option.
+</para>

diff --git a/xmldoc/formats/options/nmea-get_posn.xml b/xmldoc/formats/options/nmea-get_posn.xml
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+++ b/xmldoc/formats/options/nmea-get_posn.xml
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+<para>This options, when specified, returns the current position as a single
+waypoint.
+</para>