Fix some bugs in the time-dependent adjoint code:   * Delete any initial conditions for the adjoint prognostic variables that were left over     from the forward flml   * Fix a sign error in the timestepping operator assembled in the initial adjoint computation
Fix some bugs in the time-dependent adjoint code:
  * Delete any initial conditions for the adjoint prognostic variables that were left over
    from the forward flml
  * Fix a sign error in the timestepping operator assembled in the initial adjoint computation

iakovos-panourgias/fluidity,jjo31/ATHAM-Fluidity,jjo31/ATHAM-Fluidity,jrper/fluidity,jrper/fluidity,jrper/fluidity,rjferrier/fluidity,iakovos-panourgias/fluidity,jjo31/ATHAM-Fluidity,jjo31/ATHAM-Fluidity,iakovos-panourgias/fluidity,rjferrier/fluidity,rjferrier/fluidity,rjferrier/fluidity,iakovos-panourgias/fluidity,jjo31/ATHAM-Fluidity,jrper/fluidity,rjferrier/fluidity,jrper/fluidity,iakovos-panourgias/fluidity