revising contributors.html

[Ben Pfaff]

I noticed that contributors.html on the website could be
improved.  Currently it says:

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<p>This page lists and thanks the people which contributed and/or currently 
contribute to PSPP.</p>

<ul>
    <li><b>Ben Pfaff</b> wrote most of the program and the manual.</li>
    
    <li><b>John Williams</b> originally wrote the T-TEST procedure, which was 
subsequently re-written by John Darrington</li>
    
    <li><b>John Darrington</b> wrote the T-TEST ONEWAY and EXAMINE procedures, 
implemented support for long variable names and made numerous revisions to 
other modules.</li>
    
    <li><b>Michael Kiefte</b> did bugfixes and other enhancements.</li>
    
    <li><b>Patrick Kobly</b> did bugfixes and other enhancements.</li>
    
    <li><b>Patrick Brunier</b> maintains the PSPP website.</li>    

    <li><b>Jason Stover</b> contributed statistical and numerical
       functionality, including lib/gslextras. Jason is also an
       important contributor to libgsl used by PSPP.</li>
</ul>
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I would like to revise it to say the following.  Rationale:

        - I don't want to claim to have written "most" of PSPP
          anymore.  I did write the initial version.

        - I want to list current contributors before people who
          have disappeared.

        - I want to make sure that jmd gets proper credit for
          T-TEST.

        - Add link to GSL.

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<p>We wish to thank current active contributors to PSPP:</p>

<ul>
    <li><b>Ben Pfaff</b> wrote the initial program and manual and
    continues to contribute.</li>
    
    <li><b>John Darrington</b> wrote the T-TEST, ONEWAY, and EXAMINE
    procedures, implemented support for long variable names, and made
    numerous revisions to other modules.</li>
    
    <li><b>Jason Stover</b> contributed statistical and numerical
       functionality, including lib/gslextras. Jason is also an
       important contributor to <a href="/software/gsl">GSL</a>, used
       by PSPP.</li>

    <li><b>Patrick Brunier</b> maintains the PSPP website.</li>    
</ul>

<p>We also thank past contributors:</p>

<ul>
    <li><b>John Williams</b> wrote an initial draft of the T-TEST
    procedure.</li>
    
    <li><b>Michael Kiefte</b> contributed bug fixes and other enhancements.</li>
    
    <li><b>Patrick Kobly</b> contributed bug fixes and other enhancements.</li>
    
</ul>
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Comments?
-- 
"Sanity is not statistical."
--George Orwell