share clean up: moving stuff around



All this seems great--for sometime, I've disliked the untidiness of having files in
to_poly_solver scattered. Also, it's OK with me if the file name to_poly_solver.mac 
is changed to to_poly_solve.mac. This change might cause trouble--wxMaxima has a drop 
down that loads to_poly_solver, for example. Also the file topoly_solve can be deleted.

Finally, I see lots of things like the following:
 
commit 0a9ad5812354aad5088629b6115007ef2d567098
Author: robert_dodier <robert_dodier at users.sourceforge.net>
Date:   Sat Oct 8 19:03:15 2011 -0600

    Share clean-up: move package stringproc out of share/contrib.

Where is stringproc going?

--bw