YAML-ification and minor output restructure

test/cli/minimal/reference/source/canonical.yaml

@@ -0,0 +1,7 @@
+points:
+    zones:
+        matrix:
+            columns:
+                col: {}
+            rows:
+                row: {}

test/cli/minimal/reference/source/raw.txt

@@ -0,0 +1,3 @@
+points.zones.matrix:
+  columns.col: {}
+  rows.row: {}