v3.0.0

v3.0.0 (major release)

• added BatSplay.find_opt and BatMap.find_opt
  #941
  (nicoTolly, review by Francois Berenger)
• BatList and BatArray: sum of an empty container now return 0 rather than
  raising an exception.
  #519
  (Cedric Cellier, report by Simon Cruanes, review by François Berenger)
• BatString: split_on_char and nsplit now return a sigle empty string (rather
  than an empty list) on empty strings.
  #845, #846
  (Cedric Cellier, report by Thibault Suzanne, review by François Berenger)
• BatSeq: change Exceptionless.combine signature to make it really
  exceptionless.
  #418
  (Cedric Cellier, report by Hezekiah M. Carty, review by François Berenger)
• BatOo: This module was unwelcomed and has been removed
  #848
  (Cedric Cellier, report by Max Mouratov, review by François Berenger)
• BatFilename: Added to Batteries from the stdlib, with the addition of
  split_extension.
  #445
  (Cedric Cellier, report and review by François Berenger)
• BatSet: the Infix module is no more, as it was incompatible with
  metaocaml
  #908
  (Cedric Cellier, review by Gabriel Scherer and François Berenger)
• BatIO: make the ?cleanup parameter of BatIO.input_channel true by default:
  closing the returned input will close the underlying input channel
  #109, #489
  (Simon Cruanes, report by Michael Ekstrand)
• BatArray: add split : 'a BatOrd.ord -> 'a array -> 'a -> int * int
  search for the range equal to a given element in a sorted array
  #443, #470
  (Simon Cruanes, Gabriel Scherer, request by François Berenger)
• BatEnum: BatEnum.combine is now curried, just like List.combine,
  its signature changes from:
  val combine: 'a t * 'b t -> ('a * 'b) t
  to
  val combine: 'a t -> 'b t -> ('a * 'b) t
  #578
  (François Berenger)
• PSet: add a ?cmp argument to every function that creates a PSet:
  of_enum, of_list, of_array are changed. The default value is Pervasives.compare.
  #679
  (Cedric Cellier)