* we have now several bstrs:

* we have now several bstrs:
  * bstr: simply gives the string
  * xbstr: gives string and its length
  * lbstr: gives the long value of the item
  * ibstr: gives the int value of the item
  * havebstr: whether this bstr and if it wasn't set empty
  * yesbstr: returns true if the value equals "yes"
there also is a CAPITAL version of each, for dynamicaly calculated keys.
* replaced all atol(bstr()), strcmp(bstr(), "yes") IsEmptyStr(bstr()) by the above.