[with spkg; positive review] change genus2reduction to include GPL copyright file and email from liu making the program GPL'd

Imported from <a href="http://trac.sagemath.org/sage_trac/ticket/4743">trac #4743</a>.

The new spkg is here:

  http://sage.math.washington.edu/home/was/patches/genus2reduction-0.3.p4.spkg

I am upstream for this program.  I modified the src/ subdirectory to include the GPL COPYING file, along with an email Liu sent me where he officially GPL'd genus2reduction. 

This change was caused by a request from Karl Meyer who is packaging sage for Fedora. 

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