 one for each input position. All options for a
single SCF calculation apply.

The general structure of the file to be parsed is:
==================================================

<b>BEGIN</b>
  <b>BEGIN_PATH_INPUT</b>
    ... neb specific namelists and cards
  <b>END_PATH_INPUT</b>

  <b>BEGIN_ENGINE_INPUT</b>
    ...pw specific namelists and cards
    <b>BEGIN_POSITIONS</b>
      <b>FIRST_IMAGE</b>
      ...pw ATOMIC_POSITIONS card
      <b>INTERMEDIATE_IMAGE</b>
      ...pw ATOMIC_POSITIONS card
      