Fix 2000/natori and add alt code

The author suggested alternate code for those in the southern hemisphere
which the natori.alt.c now has.

2000/natori/natori.alt.c

@@ -0,0 +1,4 @@
+double l;
+int moon(int _, int o, int O){
+return putchar((_--+22&&_+44&&main(_,-43,_),_&&(int)o)?(main(-43,(int)++o,(int)O),((l=((int)o+21)/sqrt(3-(int)O*22-(int)O*(int)O),l*l<4&&(fabs(((time(0)-607728)%2551443)/405859.-4.7+acos(-l/2))<1.57))[" #"])):10);}
+main(int _,char**o,char**O){return moon(_, (int)o, (int)O); }