Fixed the bug of multiple parsing.
Fixed the bug of multiple parsing.

This was the case where setting a new value to evaluate against
the function and causes parsing of the function string again
and again. The reason behind this bug was check of value time
modified > parse time or value time modified > function expression
check time.

hendradarwin/VTK,jmerkow/VTK,SimVascular/VTK,mspark93/VTK,cjh1/VTK,msmolens/VTK,ashray/VTK-EVM,msmolens/VTK,jmerkow/VTK,msmolens/VTK,spthaolt/VTK,cjh1/VTK,sumedhasingla/VTK,demarle/VTK,sumedhasingla/VTK,cjh1/VTK,berendkleinhaneveld/VTK,sankhesh/VTK,ashray/VTK-EVM,mspark93/VTK,demarle/VTK,gram526/VTK,johnkit/vtk-dev,collects/VTK,candy7393/VTK,keithroe/vtkoptix,sankhesh/VTK,sankhesh/VTK,demarle/VTK,cjh1/VTK,aashish24/VTK-old,hendradarwin/VTK,berendkleinhaneveld/VTK,hendradarwin/VTK,spthaolt/VTK,sankhesh/VTK,sumedhasingla/VTK,collects/VTK,jmerkow/VTK,jmerkow/VTK,collects/VTK,cjh1/VTK,gram526/VTK,SimVascular/VTK,candy7393/VTK,sumedhasingla/VTK,aashish24/VTK-old,johnkit/vtk-dev,gram526/VTK,spthaolt/VTK,SimVascular/VTK,spthaolt/VTK,mspark93/VTK,daviddoria/PointGraphsPhase1,mspark93/VTK,jmerkow/VTK,ashray/VTK-EVM,johnkit/vtk-dev,gram526/VTK,daviddoria/PointGraphsPhase1,sumedhasingla/VTK,candy7393/VTK,hendradarwin/VTK,gram526/VTK,keithroe/vtkoptix,candy7393/VTK,hendradarwin/VTK,msmolens/VTK,ashray/VTK-EVM,mspark93/VTK,berendkleinhaneveld/VTK,aashish24/VTK-old,biddisco/VTK,msmolens/VTK,msmolens/VTK,SimVascular/VTK,hendradarwin/VTK,biddisco/VTK,johnkit/vtk-dev,cjh1/VTK,candy7393/VTK,hendradarwin/VTK,johnkit/vtk-dev,demarle/VTK,jmerkow/VTK,mspark93/VTK,berendkleinhaneveld/VTK,daviddoria/PointGraphsPhase1,sankhesh/VTK,candy7393/VTK,SimVascular/VTK,sankhesh/VTK,candy7393/VTK,johnkit/vtk-dev,berendkleinhaneveld/VTK,SimVascular/VTK,daviddoria/PointGraphsPhase1,sumedhasingla/VTK,gram526/VTK,keithroe/vtkoptix,ashray/VTK-EVM,aashish24/VTK-old,biddisco/VTK,biddisco/VTK,spthaolt/VTK,SimVascular/VTK,gram526/VTK,mspark93/VTK,keithroe/vtkoptix,ashray/VTK-EVM,sumedhasingla/VTK,aashish24/VTK-old,sumedhasingla/VTK,daviddoria/PointGraphsPhase1,biddisco/VTK,daviddoria/PointGraphsPhase1,spthaolt/VTK,candy7393/VTK,jmerkow/VTK,msmolens/VTK,SimVascular/VTK,demarle/VTK,biddisco/VTK,aashish24/VTK-old,keithroe/vtkoptix,msmolens/VTK,demarle/VTK,gram526/VTK,keithroe/vtkoptix,johnkit/vtk-dev,demarle/VTK,sankhesh/VTK,berendkleinhaneveld/VTK,collects/VTK,jmerkow/VTK,sankhesh/VTK,ashray/VTK-EVM,keithroe/vtkoptix,collects/VTK,keithroe/vtkoptix,spthaolt/VTK,mspark93/VTK,biddisco/VTK,ashray/VTK-EVM,demarle/VTK,collects/VTK,berendkleinhaneveld/VTK