AMR test case: Fixed bug of uninitialized member variable.

The uninitialized member variable "nLocalParticles_m" of the AmrPartBunch class caused problems for
multi-bunch simulations.

modified:   ippl/test/AMR/AmrPartBunch.cpp

ippl/test/AMR/AmrPartBunch.cpp

@@ -12,14 +12,16 @@ size_t AmrPartBunch::nAttributes = 10;
 AmrPartBunch::AmrPartBunch(const Geometry& geom,
                            const DistributionMapping & dmap,
                            const BoxArray & ba)
-    : ParticleContainer(geom, dmap, ba)
+    : ParticleContainer(geom, dmap, ba),
+      nLocalParticles_m(0)
 { }
 
 AmrPartBunch::AmrPartBunch(const Array<Geometry>& geom,
                            const Array<DistributionMapping>& dmap,
                            const Array<BoxArray>& ba,
                            const Array<int>& rr)
-    : ParticleContainer(geom, dmap, ba, rr)
+    : ParticleContainer(geom, dmap, ba, rr),
+      nLocalParticles_m(0)
 { }
 
 
@@ -248,4 +250,4 @@ void AmrPartBunch::setB(Vector_t Bf, int i) {
     
     for (int d = 0; d < 3; ++d)
         m_particles[l][g][dq].m_data[d + 7] = Bf(d);
-}
\ No newline at end of file
+}