Add missing policies, modify toDense function
Added missing policies to cpy sparse matrix in dense matrix. Added an optional parameter to toDense function in xGenericSparseMatrix: if zero fill==false, toDense does not reset the dense matrix to zero before filling it. It can be used to fill a dense matrix blockwise. The default value of this parameter is true, so it does not change anything in pieces of code which were previously using this function.
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