Lyrics on beamed notes not correctly converted by musicxml2ly

[Hans Aikema]

> I'm not top posting.

When the MusicXML input contains beamed fast notes (8th, 16th etc) the lyrics
accompanying each note after the first of the beamed notes is not imported into
the lilypond file.

A sample source MusicXMLfile created with MuseScore demonstrating this issue is
copied in below. The lyric on the second note (two) is not put in the resulting
Lilypond file when converting using musicxml2ly. This renders music2ly almost
useless for vocal parts, as all lyrics on beamed notes after the first note is
lost in translation:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE score-partwise PUBLIC "-//Recordare//DTD MusicXML 2.0 Partwise//EN"
"http://www.musicxml.org/dtds/partwise.dtd";>
<score-partwise>
  <identification>
    <encoding>
      <software>MuseScore 1.0</software>
      <encoding-date>2011-02-19</encoding-date>
      </encoding>
    </identification>
  <defaults>
    <scaling>
      <millimeters>9.456</millimeters>
      <tenths>40</tenths>
      </scaling>
    <page-layout>
      <page-height>1256.35</page-height>
      <page-width>888.325</page-width>
      <page-margins type="both">
        <left-margin>42.3012</left-margin>
        <right-margin>42.3012</right-margin>
        <top-margin>42.3012</top-margin>
        <bottom-margin>84.6024</bottom-margin>
        </page-margins>
      </page-layout>
    </defaults>
  <credit page="1">
    <credit-words default-x="444.162" default-y="1214.04" font-size="24"
justify="center" valign="top">LyricsWithBeamedNotes</credit-words>
    </credit>
  <part-list>
    <score-part id="P1">
      <part-name>Voice</part-name>
      <part-abbreviation>Vo.</part-abbreviation>
      <score-instrument id="P1-I3">
        <instrument-name>Voice</instrument-name>
        </score-instrument>
      <midi-instrument id="P1-I3">
        <midi-channel>1</midi-channel>
        <midi-program>53</midi-program>
        </midi-instrument>
      </score-part>
    </part-list>
  <part id="P1">
    <measure number="1" width="736.50">
      <print>
        <system-layout>
          <system-margins>
            <left-margin>67.22</left-margin>
            <right-margin>-0.00</right-margin>
            </system-margins>
          <top-system-distance>180.00</top-system-distance>
          </system-layout>
        </print>
      <attributes>
        <divisions>4</divisions>
        <key>
          <fifths>0</fifths>
          <mode>major</mode>
          </key>
        <time>
          <beats>4</beats>
          <beat-type>4</beat-type>
          </time>
        <clef>
          <sign>G</sign>
          <line>2</line>
          </clef>
        </attributes>
      <note default-x="89.80" default-y="-25.00">
        <pitch>
          <step>A</step>
          <octave>4</octave>
          </pitch>
        <duration>1</duration>
        <voice>1</voice>
        <type>16th</type>
        <stem>up</stem>
        <beam number="1">begin</beam>
        <beam number="2">begin</beam>
        <lyric number="1">
          <syllabic>single</syllabic>
          <text>One</text>
          </lyric>
        </note>
      <note default-x="160.81" default-y="-25.00">
        <pitch>
          <step>A</step>
          <octave>4</octave>
          </pitch>
        <duration>1</duration>
        <voice>1</voice>
        <type>16th</type>
        <stem>up</stem>
        <beam number="1">end</beam>
        <beam number="2">end</beam>
        <lyric number="1">
          <syllabic>single</syllabic>
          <text>two</text>
          </lyric>
        </note>
      <note default-x="231.82" default-y="-30.00">
        <pitch>
          <step>G</step>
          <octave>4</octave>
          </pitch>
        <duration>1</duration>
        <voice>1</voice>
        <type>16th</type>
        <stem>up</stem>
        <lyric number="1">
          <syllabic>single</syllabic>
          <text>three</text>
          </lyric>
        </note>
      <note>
        <rest/>
        <duration>1</duration>
        <voice>1</voice>
        <type>16th</type>
        </note>
      <note>
        <rest/>
        <duration>4</duration>
        <voice>1</voice>
        <type>quarter</type>
        </note>
      <note>
        <rest/>
        <duration>8</duration>
        <voice>1</voice>
        <type>half</type>
        </note>
      <barline location="right">
        <bar-style>light-heavy</bar-style>
        </barline>
      </measure>
    </part>
  </score-partwise>