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`