Merge pull request #149 from Remi-Gau/remi-m0estimate

[ENH] update fieldname m0 scan estimate

+bids/layout.m

@@ -647,7 +647,7 @@ function tolerant_message(use_schema, msg)
         m0_explanation = [ ...
                           'this is a single estimated M0 value, ', ...
                           'e.g. when the M0 is obtained from an external scan and/or study'];
-        m0_value = perf.meta.M0;
+        m0_value = perf.meta.M0Estimate;
 
       case 'Absent'
         m0_type = 'use_control_as_m0';