Add doc for unicsv options 'datum' and 'grid'.

diff --git a/gpsbabel/xmldoc/formats/options/unicsv-datum.xml b/gpsbabel/xmldoc/formats/options/unicsv-datum.xml
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+++ b/gpsbabel/xmldoc/formats/options/unicsv-datum.xml
@@ -0,0 +1,4 @@
+<para>
+   This option specifies the datum to be used on output. Valid values for this 
+   option are listed in <xref linkend="Datums" />.
+</para>

diff --git a/gpsbabel/xmldoc/formats/options/unicsv-grid.xml b/gpsbabel/xmldoc/formats/options/unicsv-grid.xml
new file mode 100644 (file)
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+++ b/gpsbabel/xmldoc/formats/options/unicsv-grid.xml
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+<para>
+   This value specifies the grid to be used on write. It is similar to
+   the grid option of garmin_txt (see <xref linkend="garmin_grid" />). The only difference is that unicsv does not
+   write a degree sign (°) into the output file.
+</para>
+<para>
+   Without this option unicsv writes the coordinates as simple numbers like in the samples above.
+</para>