Return the next line of the file as a string.

         FGETS(FID) returns the next line of a file associated with file

         identifier fid as a MATLAB string. The newline IS included.

         Use FGETLRIWZWQ() to get the next line WITHOUT the newline included.

  If just an end-of-file is encountered then -1 is returned.



         IMPORTANT: Please note that this is intended to be used ONLY with 

                    text files. If by mistake you read a "binary" file

                    without newline characters this routine may take a

         long time for large files.