Garbage collection now much better, not good

There's clearly still a lot of things getting incremented but not decremented.

src/repl.c

@@ -112,9 +112,17 @@ repl( FILE * in_stream, FILE * out_stream, FILE * error_stream,
             }
             break;
         } else {
-            repl_print( output_stream, repl_eval( input ) );
+            struct cons_pointer val = repl_eval( input );
+            inc_ref(val);
+            repl_print( output_stream, val );
+            dec_ref(val);
         }
+
         dec_ref( input );
     }
+
+    dec_ref(input_stream);
+    dec_ref(output_stream);
+
     debug_print( L"Leaving repl\n", DEBUG_REPL );
 }