Use 'neq' instead of 'df' for Boolean not-equal

As noted in #3 bug report, 'df' is a poor choice for Boolean not-equal, standing for 'different' and at risk of being confused for 'difference'. 'neq' is a unambiguous choice standing for 'not-equal' in similar fashion as already present operators: 'eq', 'leq', 'geq'. Fixes #3.
open-psa · Feb 22, 2017 · 547193b · 547193b
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diff --git a/mef/schema/boolean_operation.rnc b/mef/schema/boolean_operation.rnc
@@ -3,7 +3,7 @@ Boolean-operation =
   | element and { expression+ }
   | element or { expression+ }
   | element eq { expression, expression }
-  | element df { expression, expression }
+  | element neq { expression, expression }
   | element lt { expression, expression }
   | element gt { expression, expression }
   | element leq { expression, expression }

diff --git a/mef/stochastic_layer.rst b/mef/stochastic_layer.rst
@@ -212,7 +212,7 @@ Their XML representation is given in :numref:`schema_boolean_operation`.
     +----------+------------+---------------+
     | **eq**   | 2          | :math:`=`     |
     +----------+------------+---------------+
-    | **df**   | 2          | :math:`\neq`  |
+    | **neq**  | 2          | :math:`\neq`  |
     +----------+------------+---------------+
     | **lt**   | 2          | :math:`<`     |
     +----------+------------+---------------+