Add real machine epsilon from daisy

coq/exps.v

@@ -2,6 +2,7 @@
 Formalization of the base expression language for the daisy framework
  **)
 Require Import Coq.Reals.Reals.
+Require Import Daisy.realConversion.
 Set Implicit Arguments.
 (**
   Expressions will use binary operators.
@@ -31,7 +32,7 @@ Inductive exp (V:Type): Type :=
   Define the machine epsilon for floating point operations.
   FIXME: Currently set to 1.0 instead of the concrete value!
 **)
-Definition m_eps:R := 1.
+Definition machineEpsilon:R := realFromNum  59604645 7 8.
 (**
   Define a perturbation function to ease writing of basic definitions
 **)