Units separated to their own block, and properly tested

test/points/000_units.yaml

@@ -0,0 +1,11 @@
+units:
+  a: cy - 7
+variables:
+  b: a * 1.5
+points:
+  zones:
+    matrix:
+      columns:
+        col:
+      rows:
+        row:

test/points/000_units___units.json

@@ -0,0 +1,7 @@
+{
+    "u": 19,
+    "cx": 18,
+    "cy": 17,
+    "a": 10,
+    "b": 15
+}