version 1.1, 10/04/2013
=======================
  o installation using ocamlfind (if found) or in `ocamlc -where`/bitv otherwise
  o fixed of_int64_(u)s on a 32-bit architecture (thanks to Florent Monnier)

version 1.0, 14/08/2012
=======================
  o functions to/of_int64_s
  o new functions output_bin/input_bin for export/import in a
    machine-independent way (contribution from Bruno Guillaume)
  o fixed installation (patch from Bruno Guillaume)

version 0.9, 20/06/2012
=======================
 o fixed tarball (test.ml was missing)
 o patched installation to use $(DESTDIR), if any (patch from Bruno Guillaume)

version 0.8, 28/02/2012
=======================
 o two different modules L and M for conversions to and from string (least
   and most significant bits first, respectively); apologies for
   API incompatibility
 o improved implementation of iteri_true

version 0.7, 03/04/2008
=======================
 o fixed bug with unsafe_blit when len=0 (could affect blit, sub, append,
   concat and fill when used with 0-length bit vectors), thanks to Pat Rondon

version 0.6, 18/02/2005
=======================
 o added iteri_true
 o added foldi_left and foldi_right
 o patch for ocaml >= 3.08 (0xffffffff is no more accepted as a literal)
 o fixed Invalid_argument messages (now exactly the function name)

version 0.5, 22/11/2002
=======================
 o added print : formatter -> t -> unit
 o from_list now fails on negative indexes (patch from Karl Zilles)
 o from_list_with_length to specify the length (patch from Karl Zilles)

version 0.4, 29/8/2002
======================
 o to_list/from_list to convert to/from lists of integers
 o added gray_iter to iterate over all bit vectors of length n
 o configuration with autoconf

version 0.3, 31/5/2000
======================
 o fixed bug in bw_not thanks to Damir Jamsek

version 0.2, 24/4/2000
======================
 o normalization, so that generic equality can be used
 o efficient implementations of append, sub, blit, concat and fill
 o documentation using ocamlweb
 o to_string, from_string
 o bitwise operations, all_zeros

version 0.1
===========
 o first release