Merge remote-tracking branch 'ygrek/warnings'

Conflicts:
	compiler/gen_OCaml.ml

close #34

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Merge pull request #21 from ygrek/include

add `include` directive to allow split extprot files

Test constructor extension backward-compatibility.

Msg_buffer: proper behavior when buffer size approaches Sys.max_strin…

…g_length.

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Version 1.1.1.