Make implicit narrowing conversions explicit

[vvolkl]

There are numerous occasions in cepcsw where a double is implicitly converted to a float. Newer compilers treat this as an error (-W-c++11-narrowing)

I have added the -W-no-c++11-narrowing to the recipe, but it's probably good practice to explicitly add the casts at one point (I started, but there are quite a few instances and this is not very urgent), for example:

diff --git a/Digitisers/SimpleDigi/src/TPCDigiAlg.cpp b/Digitisers/SimpleDigi/src/TPCDigiAlg.cpp
index ebb1df4..6aaa5f1 100644
--- a/Digitisers/SimpleDigi/src/TPCDigiAlg.cpp
+++ b/Digitisers/SimpleDigi/src/TPCDigiAlg.cpp
@@ -1231,12 +1231,13 @@ void TPCDigiAlg::writeVoxelToHit( Voxel_tpc* aVoxel){
   }
   debug() << "==============" << endmsg;
   // For no error in R
-  std::array<float,TRKHITNCOVMATRIX> covMat={sin(unsmearedPhi)*sin(unsmearedPhi)*tpcRPhiRes*tpcRPhiRes,
-    -cos(unsmearedPhi)*sin(unsmearedPhi)*tpcRPhiRes*tpcRPhiRes,
-    cos(unsmearedPhi)*cos(unsmearedPhi)*tpcRPhiRes*tpcRPhiRes,
-    0.,
-    0.,
-    float(tpcZRes*tpcZRes)};
+    std::array<float,TRKHITNCOVMATRIX> covMat=
+        {static_cast<float>(sin(unsmearedPhi)*sin(unsmearedPhi)*tpcRPhiRes*tpcRPhiRes),
+         static_cast<float>(-cos(unsmearedPhi)*sin(unsmearedPhi)*tpcRPhiRes*tpcRPhiRes),
+         static_cast<float>(cos(unsmearedPhi)*cos(unsmearedPhi)*tpcRPhiRes*tpcRPhiRes),
+         0.,
+         0.,
+         static_cast<float>(tpcZRes*tpcZRes)};
 
   trkHit.setCovMatrix(covMat);