Batteries user guide : BatScanf.Scanning

`sig type scanbuf = Scanf.Scanning.scanbuf val stdib : BatScanf.Scanning.scanbuf val from_string : string -> BatScanf.Scanning.scanbuf val from_file : string -> BatScanf.Scanning.scanbuf val from_file_bin : string -> BatScanf.Scanning.scanbuf val from_function : (unit -> char) -> BatScanf.Scanning.scanbuf val from_input : BatIO.input -> BatScanf.Scanning.scanbuf val end_of_input : BatScanf.Scanning.scanbuf -> bool val beginning_of_input : BatScanf.Scanning.scanbuf -> bool val name_of_input : BatScanf.Scanning.scanbuf -> string val from_channel : BatIO.input -> BatScanf.Scanning.scanbuf end`