Dune 2.6.0

Fix a bug where valid lib names in dune init exec --libs=lib1,lib2 results in an error. (#3444, fix #3443, @bikallem)

Add and enabled_ if field to the install stanza. Enforce the same variable restrictions for enabled_if fields in the executable and install stanzas than in the library stanza. When using dune lang < 2.6, the usage of forbidden variables in executables stanzas with only trigger a warning to maintain compatibility. (#3408 and #3496, fixes #3354, @voodoos)

Insert a constraint one the version of dune when the user explicitly specify the dependency on dune in the dune-project file (#3434 , fixes #3427, @diml)

Generate correct META files for sub-libraries (of the form lib.foo) that contain .js runtime files. (#3445, @hhugo)

Add a (no-infer ...) action that prevents inference of targets and dependencies in actions. (#3456, fixes #2006, @roddyyaga)

Correctly infer targets for the diff? action. (#3457, fixes #2990, @greedy)

Fix $ dune print-rules crashing (#3459, fixes #3440, @rgrinberg)

Simplify js_of_ocaml rules using js_of_ocaml.3.6 (#3375, @hhugo)

Add a new ocaml-merlin subcommand that can be used by Merlin to get configuration directly from dune instead of using .merlin files. (#3395, @voodoos)

Remove experimental variants feature and make default implementations part of the language (#3491, fixes #3483, @rgrinberg)