For debugging purposes.

<p>
In many configuration manipulation tools, such as <tt>makedipole</tt>, the
displacement field of one dislocation is not immediately applied to the atomic positions.
Instead, there is an option to accumulate the displacement fields
in the vector array <tt>storedr</tt> when multipole dislocations are to be introduced.
The displacement field is applied to the atomic positions after the displacement field
of the last dislocation has been included in the sum.

