Fix fastq_quality_boxplot requirements

Author: mvdbeek

tool_collections/fastx_toolkit/fastq_quality_boxplot/fastq_quality_boxplot.xml

@@ -1,6 +1,8 @@
 <tool id="cshl_fastq_quality_boxplot" name="Draw quality score boxplot" version="@VERSION@">
     <description></description>
-    <expand macro="requirements" />
+    <expand macro="requirements">
+        <requirement type="package" version="5.0.4">gnuplot</requirement>
+    </expand>
     <macros>
         <import>fastx_macros.xml</import>
     </macros>
@@ -17,7 +19,7 @@
     <tests>
         <test>
             <param name="input" value="fastq_stats1.out" ftype="txt"></param>
-            <output name="output" file="quality_boxplot_out.png"></output>
+            <output name="output" file="quality_boxplot_out.png" compare="sim_size"></output>
         </test>
     </tests>
 <help>