Release notes updated

Author: MartinOtter

docs/src/index.md

@@ -77,24 +77,40 @@ julia> ]add ModiaBase
 
 ## Release Notes
 
-### Version 0.9.0
+### Version 0.9.0-dev
 
-- Hierarchical names in function calls supported (e.g. a.b.c.f(..)).
+Non-backwards compatible improvements
 
-- Efficiency of linear equations setup changed (memory allocation drastically reduced)
+- Parameter values in the code are now type cast to the type of the parameter value from the 
+  `@instantiatedModel(..)` call. The benefit is that access of parameter values in the code is type stable
+  and operations with the parameter value are more efficient and at run-time no memory is allocated.
+  Existing models can no longer be simulated, if parameter values provided via `simulate!(.., merge=xx)` are not
+  type compatible to their definition. For example, an error is thrown if the @instantedModel(..) uses a Float64 value and the
+  `simulate!(.., merge=xx)` uses a `Measurement{Float64}` value for the same parameter.
+  
+Other improvements
 
-- Include DAE-Mode in solution of linear equation system (if DAE integrator is used and all unknowns of linear
-  equation system are part of the DAE states, solve the linear equation system during continuous integration
-  via DAE solver (= usually large speed-up, for larger linear equation system).
+- Hierarchical names in function calls supported (e.g. `a.b.c.fc(..)`). 
+
+- Functions can return multiple values, e.g. `(tau1,tau2) = generalizedForces(derw1, derw2)`.
 
-- Large speedup of symbolic transformation, if function depends on many input arguments 
-  (includes new operator implicitDependency(..)).
+- Large speedup of symbolic transformation, if function depends on many input (and output) arguments 
+  (includes new operator `implicitDependency(..)`).
 
 - Support for StaticArrays variables (the StaticArrays feature is kept in the generated AST).
 
 - Support for Array variables (especially of state and tearing variables)
   where the dimension can change after @instantiateModel(..)
-  
+
+- Included DAE-Mode in solution of linear equation system (if DAE integrator is used and all unknowns of a linear
+  equation system are part of the DAE states, solve the linear equation system during continuous integration
+  via DAE solver (= usually large simulation speed-up, for larger linear equation systems)  
+ 
+Bug fixes
+
+- Do no longer expand the unit macro in the AST, such as `u"N"`, because otherwise `logCode=true` results in wrong code
+  (previously, a `u"N"`  definition in the model was displayed in the code as `N` which is not correct Julia code).
+
 
 ### Version 0.8.1