1.4.0

CHANGES:

• Do not fail if the output of ocamlc -config doesn't include
  standard_runtime (#1326, @diml)

• Let Configurator.V1.C_define.import handle negative integers
  (#1334, @Chris00)

• Re-execute actions when a target is modified by the user inside
  _build (#1343, fix #1342, @diml)

• Pass --set-switch to opam (#1341, fix #1337, @diml)

• Fix bad interaction between multi-directory libraries the menhir
  stanza (#1373, fix #1372, @diml)

• Integration with automatic formatters (#1252, fix #1201, @emillon)

• Better error message when using (self_build_stubs_archive ...) and
  (c_names ...) or (cxx_names ...) simultaneously.
  (#1375, fix #1306, @nojb)

• Improve name detection for packages when the prefix isn't an actual package
  (#1361, fix #1360, @rgrinberg)

• Support for new menhir rules (#863, fix #305, @fpottier, @rgrinberg)

• Do not remove flags when compiling compatibility modules for wrapped mode
  (#1382, fix #1364, @rgrinberg)

• Fix reason support when using staged_pps (#1384, @charlesetc)

• Add support for enabled_if in rule, menhir, ocamllex,
  ocamlyacc (#1387, @diml)

• Exit gracefully when a signal is received (#1366, @diml)

• Load all defined libraries recursively into utop (#1384, fix #1344,
  @rgrinberg)

• Allow to use libraries bytes, result and uchar without findlib
  installed (#1391, @nojb)

• Take argument to self_build_stubs_archive into account. (#1395, @nojb)

• Fix bad interaction between env customization and vendored
  projects: when a vendored project didn't have its own env stanza,
  the env stanza from the enclosing project was in effect (#1408,
  @diml)

• Fix stop early bug when scanning for watermarks (#1423, @diml)