Revert {Structure,Union}::getField to previous behavior

src/factory/FieldCreateFactory.cpp

@@ -532,6 +532,15 @@ string Structure::getID() const
 	return id;
 }
 
+FieldConstPtr  Structure::getField(string const & fieldName) const {
+    for(size_t i=0, N=fields.size(); i<N; i++) {
+        if(fieldName==fieldNames[i]) {
+            return fields[i];
+        }
+    }
+    return FieldConstPtr();
+}
+
 size_t Structure::getFieldIndex(string const &fieldName) const {
     size_t numberFields = fields.size();
     for(size_t i=0; i<numberFields; i++) {
@@ -750,6 +759,16 @@ string Union::getID() const
 	return id;
 }
 
+FieldConstPtr  Union::getField(string const & fieldName) const {
+    size_t numberFields = fields.size();
+    for(size_t i=0; i<numberFields; i++) {
+        FieldConstPtr pfield = fields[i];
+        int result = fieldName.compare(fieldNames[i]);
+        if(result==0) return pfield;
+    }
+    return FieldConstPtr();
+}
+
 size_t Union::getFieldIndex(string const &fieldName) const {
     size_t numberFields = fields.size();
     for(size_t i=0; i<numberFields; i++) {