FEM: Multiframe adoptions

- To support timedata and the relevant filters the pipeline needs to be fully setup, hence not only working on data
 - Multiblock source algorithm is needed to supply the time data for the algorithms

src/Mod/Fem/App/FemPostPipelinePy.xml

@@ -25,7 +25,7 @@
         </Methode>
         <Methode Name="load">
             <Documentation>
-                <UserDocu>Load a result object</UserDocu>
+                <UserDocu>Load a single result object or create a multiframe result by loading multiple result frames. If multistep is wanted, 4 argumenhts are needed: 1. List of result object each being one frame, 2. List of values valid for each frame (e.g. [s] if time data), 3. the unit of the value, 4. the Description of the frames</UserDocu>
             </Documentation>
         </Methode>
         <Methode Name="recomputeChildren">