fm_populate Subroutine

  subroutine fm_populate(self)
    use run_parameters, only: has_phi, has_apar, has_bpar
    use fields_arrays, only: phi, apar, bpar, phinew, aparnew, bparnew
    use dist_fn_arrays, only: g
    use kt_grids, only: kwork_filter
    use array_utils, only: zero_array
    implicit none
    class(fieldmat_type), intent(inout) :: self
    integer :: ifl, pts_remain, ik, is

    if(self%no_populate) return

    !First initialise everything to 0
    call zero_array(g)
    call zero_array(phi)
    call zero_array(phinew)
    call zero_array(apar)
    call zero_array(aparnew)
    call zero_array(bpar)
    call zero_array(bparnew)

    !Initialise field counter
    ifl=0

    !Do phi
    if(has_phi) then
       !Set the number of points left
       pts_remain=self%npts-self%nbound

       !Increment the field counter
       ifl=ifl+1

       !Reset the filter array
       kwork_filter=.false.

       !Reset the init state arrays
       self%kyb%initdone=.false.
       do ik=1,self%naky
          self%kyb(ik)%supercells%initdone=.false.
          do is=1,self%kyb(ik)%nsupercell
             self%kyb(ik)%supercells(is)%initialised=.false.
          enddo
       enddo

       !Now loop over all points and initialise
       do while(pts_remain.gt.0)
          call self%init_next_field_points(phinew,pts_remain,kwork_filter,ifl)
       enddo
    endif

    !Do apar
    if(has_apar) then
       !Set the number of points left
       pts_remain=self%npts-self%nbound

       !Increment the field counter
       ifl=ifl+1

       !Reset the filter array
       kwork_filter=.false.

       !Reset the init state arrays
       self%kyb%initdone=.false.
       do ik=1,self%naky
          self%kyb(ik)%supercells%initdone=.false.
          do is=1,self%kyb(ik)%nsupercell
             self%kyb(ik)%supercells(is)%initialised=.false.
          enddo
       enddo

       !Now loop over all points and initialise
       do while(pts_remain.gt.0)
          call self%init_next_field_points(aparnew,pts_remain,kwork_filter,ifl)
       enddo
    endif

    !Do bpar
    if(has_bpar) then
       !Set the number of points left
       pts_remain=self%npts-self%nbound

       !Increment the field counter
       ifl=ifl+1

       !Reset the filter array
       kwork_filter=.false.

       !Reset the init state arrays
       self%kyb%initdone=.false.
       do ik=1,self%naky
          self%kyb(ik)%supercells%initdone=.false.
          do is=1,self%kyb(ik)%nsupercell
             self%kyb(ik)%supercells(is)%initialised=.false.
          enddo
       enddo

       !Now loop over all points and initialise
       do while(pts_remain.gt.0)
          call self%init_next_field_points(bparnew,pts_remain,kwork_filter,ifl)
       enddo
    endif
    
    !Reset the filter array
    kwork_filter=.false.
  end subroutine fm_populate