1.6.0

CHANGES:

• Expand variables in install stanzas (#1354, @mseri)

• Add predicate language support for specifying sub directories. This allows the
  use globs, set operations, and special values in specifying the sub
  directories used for the build. For example: (dirs :standard \ lib*) will
  use all directories except those that start with lib. (#1517, #1568,
  @rgrinberg)

• Add binaries field to the (env ..) stanza. This field sets and overrides
  binaries for rules defined in a directory. (#1521, @rgrinberg)

• Fix a crash caused by using an extension in a project without
  dune-project file (#1535, fix #1529, @diml)

• Allow %{bin:..}, %{exe:..}, and other static expansions in the deps
  field. (#1155, fix #1531, @rgrinberg)

• Fix bad interaction between on-demand ppx rewriters and using multiple build
  contexts (#1545, @diml)

• Fix handling of installed .dune files when the backend is declared via a
  dune file (#1551, fixes #1549, @diml)

• Add a --stats command line option to record resource usage (#1543, @diml)

• Fix dune build @doc deleting highlight.pack.js on rebuilds, after the
  first build (#1557, @aantron).

• Allow targets to be directories, which Dune will treat opaquely
  (#1547, @jordwalke)

• Support for OCaml 4.08: List.t is now provided by OCaml (#1561, @ejgallego)

• Exclude the local esy directory (_esy) from the list of watched directories
  (#1578, @andreypopp)

• Fix the output of dune external-lib-deps (#1594, @diml)

• Introduce data_only_dirs to replace ignored_subdirs. ignored_subdirs is
  deprecated since 1.6. (#1590, @rgrinberg)