Fix create customer on outgoing invoice download page

[mladjo2505]

Closes #446 Should be deployed with FB PR # 759

[stoivo]

When we want to download a invoice. 
Match it on firma id. 
  if there is one match
    if we have customer nr and it matches, it is awesome.
    if it doesn't match 
      print a waring message "Kundenummer i fakturabank(xxx) og lodo(yyy) er ulike" where we print "klar til bilagsføring ...""
      it is just a waring and we should be able to bookkeep this invoice, Use the accountplan where the Firma id matches
  else when there is several matches
    if one matches on customer nr use that one 
      print a waring message like "Kundenummer i fakturabank(xxx) og lodo(yyy) er like, fant flere match(xxx,yyy,zzz)"
    else no matches
      print a waring message like "Kundenummer i fakturabank(xxx) og lodo(yyy) er ulike, fant flere men ingen match(xxx,yyy,zzz)"

Every place where we refer to a accountplan make a link to the accountplan.

[stoivo]

Also look at the state on lodo2016, it looks like It jammed on a org nr

[stoivo]

We did a review, We will do testing on staging environment before i add my final review.

[hildegunn95]

Testet, all good, ready to be deployed.