Update fix_perturbble_zero_sigmas default.

Author: lohedges

python/BioSimSpace/Align/_align.py

@@ -2031,7 +2031,7 @@ def merge(
     mapping=None,
     allow_ring_breaking=False,
     allow_ring_size_change=False,
-    fix_perturbable_zero_sigmas=False,
+    fix_perturbable_zero_sigmas=True,
     force=False,
     roi=None,
     property_map0={},

python/BioSimSpace/Align/_merge.py

@@ -33,7 +33,7 @@ def merge(
     mapping,
     allow_ring_breaking=False,
     allow_ring_size_change=False,
-    fix_perturbable_zero_sigmas=False,
+    fix_perturbable_zero_sigmas=True,
     force=False,
     roi=None,
     property_map0={},