cutadapt: fix --max-expected-errors and add --max-average-error-rate

should be float

tools/cutadapt/cutadapt.xml

@@ -245,7 +245,8 @@ $read_mod_options.zero_cap
                 <option value="first">First: will make a decision about the read pair by inspecting whether the filtering criterion applies to the first read, ignoring the second read.</option>
 
             </param>
-            <param argument="--max-expected-errors" type="integer" min="0" optional="true" value="" label="Max expected errors" help="Discard reads whose expected number of errors (computed from quality values) exceeds this value." />
+            <param argument="--max-expected-errors" type="float" min="0" optional="true" value="" label="Max expected errors" help="Discard reads whose expected number of errors (computed from quality values) exceeds this value." />
+            <param argument="--max-average-error-rate" type="float" min="0" max="1" optional="true" value="" label="Max average expected errors" help="As --max-expected-errors (see above), but divided by length to account for reads of varying length" />
             <param argument="--discard-cassava" type="boolean" truevalue="--discard-cassava" falsevalue="" checked="false" label="Discard CASAVA filtering" help="Discard reads that did not pass CASAVA filtering (header has :Y:)." />
         </section>
 
@@ -1244,6 +1245,29 @@ $read_mod_options.zero_cap
                 <has_text text="--quality-base=64"/>
             </assert_command>
         </test>
+
+        <!-- https://github.com/marcelm/cutadapt/blame/3407ac0004d04b11ae7157934a6665ecaf82c328/tests/test_commandline.py#L1028 --> 
+        <test expect_num_outputs="3">
+            <param name="type" value="single" />
+            <param name="input_1" ftype="fastqillumina" value="cutadapt/data/maxee.fastq" />
+            <param name="max_expected_errors" value="0.9"/>
+            <param name="output_selector" value="report,info_file"/>
+            <output name="out1" file="cutadapt/cut/maxee.fastq" ftype="fastqillumina"/>
+            <output name="report">
+                <assert_contents>
+                    <has_text text="Reads with too many exp. errors:             2"/>
+                </assert_contents>
+            </output>
+            <output name="info_file">
+                <assert_contents>
+                    <has_n_lines n="4"/>
+                    <has_text text="ee_0.8&#09;-1&#09;ACGTTGCA&#09;++++++++"/>
+                </assert_contents>
+            </output>
+            <assert_command>
+                <has_text text="--max-expected-errors=0.9"/>
+            </assert_command>
+        </test>
     </tests>
 
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