Fix -scan

Merge pull request OCamlPro#93 from lefessan/2017-05-05-fix-for-flow

Fix autolink when no ocaml module

ocp-build: add 'install_subdir' project option

Changes for 1.99.17-beta

Merge pull request OCamlPro#29 from lefessan/2016-05-12-fix-docstrings

Fix docstrings support in ocp-pp

Merge pull request OCamlPro#25 from lefessan/2016-05-11-autoconf

Add support for OCPBUILD_METADIR

Derive the name of a rule temp directory from the rule main target hash

Fix .depends and Makefile

Fix 'install' to find build targets

Add some opam stuff, 3.12.0 compatibility