add more info on ncbi annotation of input trees

tools/ete-toolkit/ete-treeviewer.xml

@@ -94,7 +94,7 @@ curl http://etetoolkit.org/get_svg/
         <test expect_num_outputs="1"><!-- test 5: png output -->
             <param name="input_tree" value="quicktree_alignment_VARL.tre" ftype="newick"/>
             <param name="output_format" value="png" />
-            <output name="output_tree_image" file="minimal-tree-out.png" ftype="png"/>
+            <output name="output_tree_image" file="minimal-tree-out.png" ftype="png" compare="sim_size"/>
         </test>
     </tests>
     <help><![CDATA[
@@ -111,6 +111,12 @@ Input trees should be in Newick format. Optionally a fasta alignment may also be
 
 Tip: Use NCBI numeric taxids as leaf names (or in the format TaxID.sequenceName) to get on-the-fly translation of species names and lineages.
 
+For example::
+
+    ((6669.DappuP312785:1.24473,(((7739.JGI126010:4.02e-06,7739.JGI126021:0.168081)0.99985:0.848895, [..]
+
+where 66969 and 7739 are NCBI TaXIDs.
+
 **Output**
 
 The tool will output a tree image in SVG or PNG format.