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Prepare to implement incremental multi-pack indexes (MIDXs) over the next several commits by first describing the relevant prerequisites (like a new chunk in the MIDX format, the directory structure for incremental MIDXs, etc.) The format is described in detail in the patch contents below, but the high-level description is as follows. Incremental MIDXs live in $GIT_DIR/objects/pack/multi-pack-index.d, and each `*.midx` within that directory has a single "parent" MIDX, which is the MIDX layer immediately before it in the MIDX chain. The chain order resides in a file 'multi-pack-index-chain' in the same directory. Signed-off-by: Taylor Blau <me@ttaylorr.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>