Add support for the colloc tag

[humenda]

At the moment, the colloc tag is not supported by the style sheets. It seems as if it were already present as an attribute, though.
I could have a look at the weekend at changing the style sheets, but would be happy if a XSL expert would have time for this little task.

Ah yes, justification: dan-eng :)

[fceschmidt]

For a short example, the following TEI entry

         <entry>
            <form>
               <orth>deltage</orth>
            </form>
            <gramGrp>
                <pos>v</pos>
                <colloc>i</colloc>
            </gramGrp>
            <sense>
               <cit type="trans">
                  <quote>participate</quote>
                  <gramGrp>
                      <pos>v</pos>
                      <colloc>in</colloc>
                  </gramGrp>
               </cit>
               <cit type="trans">
                  <quote>take part</quote>
                  <gramGrp>
                      <pos>v</pos>
                      <colloc>in</colloc>
                  </gramGrp>
               </cit>
               <cit type="example">
                   <quote>Vi deltager i konkurrencen.</quote>
                   <cit type="translation">
                       <quote>We take part in the competition.</quote>
                   </cit>
               </cit>
            </sense>
         </entry>

generates this DICT entry:

deltage <v>
participate <v>, take part <v>
      "Vi deltager i konkurrencen."  - We take part in the competition.

If possible, I would prefer to have something like the following instead:

deltage (i) <v>
participate (in) <v>, take part (in) <v>
      "Vi deltager i konkurrencen."  - We take part in the competition.

By the way I've also thought about using something like <usg type="gram">participate in sth.</usg> for this, and frankly I don't know what would be considered more correct.

[fceschmidt]

Also I just found out that a gramGrp with only ignored element inside, such as:

<gramGrp>
    <colloc>in</colloc>
</gramGrp>

produces empty angle brackets, like:

<>

[humenda]

Yes, that makes perfectly sense. If there's a `gramGrp` tag, the `[]` are added to the output. The `colloc` tag is a special case, because it's not supported, Thanks so the brackets remain empty.

[fceschmidt]

I added a comment to line 122 of the commit 7dcdbaf. It's just about the selector in the xsl:value-of clause, which I found to be quite easy to fix, so please consider correcting this. I appreciate your dedication!