\brief Adds the contribution of a distant subdomain to the*
interpolation matrix.
The method adds contribution to the interpolation matrix.
- For each row of the matrix, elements are addded as
+ For each row of the matrix, elements are added as
a (column, coeff) pair in the _coeffs array. This column number refers
to an element on the target side via the _col_offsets array.
It is made of a series of (iproc, ielem) pairs.
