add column_name metadata to filtered sparse matrices

Author: neo417

tools/fastspar/fastspar_reduce.xml

@@ -24,8 +24,16 @@
         <param argument="--pvalue" type="float" value="0.05" label="P-value threshold"/>
     </inputs>
     <outputs>
-        <data name="correlations" format="tabular" label="${tool.name} on ${on_string}: filtered_correlations.tsv"/>
-        <data name="pvalues" format="tabular" label="${tool.name} on ${on_string}: filtered_pvalues.tsv"/>
+        <data name="correlations" format="tabular" label="${tool.name} on ${on_string}: filtered_correlations.tsv">
+            <actions>
+                <action type="metadata" name="column_names" default="column,row,value" />
+            </actions>
+        </data>
+        <data name="pvalues" format="tabular" label="${tool.name} on ${on_string}: filtered_pvalues.tsv">
+            <actions>
+                <action type="metadata" name="column_names" default="column,row,value" />
+            </actions>
+        </data>
     </outputs>
     <tests>
         <test expect_num_outputs="2">