• Fix the stub for Lwt_unix.readdir.
• Change the default method for Lwt_glib.install (use the glib main loop by default: more portable).
• Ignore invalid file descriptors returned by glib (like the emulation of select in glib does).
• Use environment variables in discover.ml:
  • Use LIBRARY_PATH and C_INCLUDE_PATH for searching headers.
  • Allow to pass flags for a library in <LIB>_CLFAGS and <LIB>_LIBS.
• Add Lwt_unix.on_signal_full.