note 75513 deleted from function.substr by tularis

Note Submitter: White-Gandalf ---- "substr" seems to be implemented in a sequential way, wasting processing power proportional to the length of the string to be worked on and/or the position of the substring to be extracted. I found a speed increase by a factor of 1000 for string extraction when the original string has a size of about 1 MB, when i replace "substr" by direct access to the chars at their index. "Substr" should not be used for extraction of very small pieces.