use same values for default args everywhere

modules/seq/alg/pymod/wrap_seq_alg.cc

@@ -54,6 +54,6 @@ BOOST_PYTHON_MODULE(_seq_alg)
   def("MergePairwiseAlignments", &MergePairwiseAlignments);
   def("Conservation", &Conservation, (arg("assign")=true, arg("prop_name")="cons"));
   def("LocalAlign", &LocalAlign, (arg("seq1"), arg("seq2"), arg("subst_weight"), 
-      arg("gap_open")=-10, arg("gap_ext")=-5));
+      arg("gap_open")=-5, arg("gap_ext")=-2));
 
 }