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gsl_monte_plain_integrate is added, but it is still buggy.

#define myfail(s) printf("%a fails, Ans0=%a, Ans=%a\n",s,Ans0,Ans)
#define dcmp(a,b) (deval(abs(1-a/b))<1e-10?1:0)
Pid=ox_launch(0,getenv("OpenXM_HOME")+"/src/ox_gsl/ox_gsl");
// Try 1.
ox_cmo_rpc(Pid,"gsl_sf_lngamma_complex_e",10^5,2); Ans=ox_pop_cmo(Pid);
Ans0=[1.05129e+06,-2.1069,0]$
if (dcmp(Ans[0],Ans0[0])) myfail("Try1 real"); else ;
if (dcmp(Ans[1],Ans0[1])) myfail("Try1 im"); else ;
// Try 2.
ox_cmo_rpc(Pid,"restart");
// Try 3.  error packet should be returned.
ox_cmo_rpc(Pid,"gsl_sf_lngamma_complex_e",10^10,2); Ans=ox_pop_cmo(Pid);
// Try 4.  
ox_cmo_rpc(Pid,"gsl_sf_lngamma_complex_e",deval(10^10),2); Ans=ox_pop_cmo(Pid);
Ans0=[2.20259e+11,2.0694,0]$
if (dcmp(Ans[0],Ans0[0])) myfail("Try4 real"); else ;
if (dcmp(Ans[1],Ans0[1])) myfail("Try4 im"); else ;
// Try 5.
ox_cmo_rpc(Pid,"gsl_integration_qags",quote(log(x)/x^(1/2)),0.01,1);
Ans=ox_pop_cmo(Pid);
end$