Fix for some files that use dynamic pointer cast in PWS merge that break cx2 compilation

library/MultiRegions/AssemblyMap/AssemblyMapDG.cpp

@@ -112,7 +112,7 @@ namespace Nektar
                     
                     if(MeshVertId.count(id) > 0)
                     {
-                        m_elmtToTrace[i][j] = boost::dynamic_pointer_cast< LocalRegions:: PointExp> ((*trace).GetExp(MeshVertId.find(id)->second));
+                        m_elmtToTrace[i][j] = (*trace).GetExp(MeshVertId.find(id)->second)->as<LocalRegions::PointExp>();
                         
                     }
                     else

library/MultiRegions/DisContField1D.cpp

@@ -254,8 +254,7 @@ namespace Nektar
         {
             set<int>::iterator it;
             LocalRegions::Expansion0DSharedPtr traceEl = 
-                boost::dynamic_pointer_cast<LocalRegions::Expansion0D>(
-                    (m_traceMap->GetElmtToTrace())[n][e]);
+                m_traceMap->GetElmtToTrace()[n][e]->as<LocalRegions::Expansion0D>();
 
             
             bool fwd = true;
@@ -815,8 +814,7 @@ namespace Nektar
                     {
                         
                         LocalRegions::Expansion0DSharedPtr vertExp =
-                            boost::dynamic_pointer_cast<
-                        LocalRegions::Expansion0D>(elmtToTrace[i][v]);
+                            elmtToTrace[i][v]->as<LocalRegions::Expansion0D>();
 
                         if(vertExp->GetLeftAdjacentElementExp()->GetGeom()->GetGlobalID() != (*m_exp)[i]->GetGeom()->GetGlobalID())
                         {

solvers/PulseWaveSolver/EquationSystems/PulseWaveSystem.cpp

@@ -288,7 +288,7 @@ namespace Nektar
                     {
                         for(int p = 0; p < 2; ++p)
                         {
-                            if(boost::dynamic_pointer_cast<LocalRegions::Expansion>(m_vessels[vesselID]->GetTraceMap()->GetElmtToTrace()[n][p])->GetGeom()->GetVid(0) == vid)
+                            if(m_vessels[vesselID]->GetTraceMap()->GetElmtToTrace()[n][p]->as<LocalRegions::Expansion>()->GetGeom()->GetVid(0) == vid)
                             {
                                 int eid = m_vessels[vesselID]->GetTraceMap()->GetElmtToTrace()[n][p]->GetElmtId();