/*You have to respect following license conditions when using this file:You  are  free to  do  anything  you want  with  this  file under  thecondition that  this header comment is  kept. You can add  any kind ofcomments after, but keep a verbatim copy of this one at the top of thefile. You  can reditribute this source  file or keep it  secret as youwish. You can use it in commercial or free products, you can resell itif someone will pay you.(C) Marian Vittek, Xref-Tech, Bratislava*/