Chebychev example doesn't compile

[Brian Gough]

James Bowman writes:
 > The Chebychev example code in the reference manual doesn't compile.
 > 
 > The line:
 >       printf ("%g %g %g\n", x, GSL_FN_EVAL (&F, x), r5, r40);
 > Should be:
 >       printf ("%g %g %g %g\n", x, GSL_FN_EVAL (&F, x), r10, r40);
 > 

Thanks for the bug report. Now fixed.