out_file/out_secondary_file: Support ${chunk_id} placeholder. fix #1705#1708

Merged

repeatedly merged 3 commits intomasterfrom chunk_id-placeholder

Oct 13, 2017

+157-29

Commits on Oct 4, 2017

out_file/out_secondary_file: Support ${chunk_id} placeholder. fix #1705
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committed

Commits on Oct 10, 2017

Change extract_placeholders API. Accept Chunk object in 2nd argument
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committed

Commits on Oct 12, 2017

Remove unused gsup in out_file
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committed