Move into version control

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diff --git a/src/armadillo/include/armadillo_bits/spop_sum_meat.hpp b/src/armadillo/include/armadillo_bits/spop_sum_meat.hpp
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+++ b/src/armadillo/include/armadillo_bits/spop_sum_meat.hpp
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: Apache-2.0
+// 
+// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
+// Copyright 2008-2016 National ICT Australia (NICTA)
+// 
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+// 
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// ------------------------------------------------------------------------
+
+
+//! \addtogroup spop_sum
+//! @{
+
+
+
+template<typename T1>
+inline
+void
+spop_sum::apply(SpMat<typename T1::elem_type>& out, const SpOp<T1,spop_sum>& in)
+  {
+  arma_extra_debug_sigprint();
+  
+  typedef typename T1::elem_type eT;
+  
+  const uword dim = in.aux_uword_a;
+  arma_debug_check( (dim > 1), "sum(): parameter 'dim' must be 0 or 1" );
+  
+  const SpProxy<T1> p(in.m);
+  
+  const uword p_n_rows = p.get_n_rows();
+  const uword p_n_cols = p.get_n_cols();
+  
+  if(p.get_n_nonzero() == 0)
+    {
+    if(dim == 0)  { out.zeros(1,p_n_cols); }
+    if(dim == 1)  { out.zeros(p_n_rows,1); }
+    
+    return;
+    }
+  
+  if(dim == 0) // find the sum in each column
+    {
+    Row<eT> acc(p_n_cols, arma_zeros_indicator());
+    
+    eT* acc_mem = acc.memptr();
+    
+    if(SpProxy<T1>::use_iterator)
+      {
+      typename SpProxy<T1>::const_iterator_type it = p.begin();
+      
+      const uword N = p.get_n_nonzero();
+
+      for(uword i=0; i < N; ++i)
+        {
+        acc_mem[it.col()] += (*it);
+        ++it;
+        }
+      }
+    else
+      {
+      for(uword col = 0; col < p_n_cols; ++col)
+        {
+        acc_mem[col] = arrayops::accumulate
+          (
+          &p.get_values()[p.get_col_ptrs()[col]],
+          p.get_col_ptrs()[col + 1] - p.get_col_ptrs()[col]
+          );
+        }
+      }
+    
+    out = acc;
+    }
+  else
+  if(dim == 1)  // find the sum in each row
+    {
+    Col<eT> acc(p_n_rows, arma_zeros_indicator());
+    
+    eT* acc_mem = acc.memptr();
+    
+    typename SpProxy<T1>::const_iterator_type it = p.begin();
+    
+    const uword N = p.get_n_nonzero();
+    
+    for(uword i=0; i < N; ++i)
+      {
+      acc_mem[it.row()] += (*it);
+      ++it;
+      }
+    
+    out = acc;
+    }
+  }
+
+
+
+//! @}