Merge branch 'jk/cat-file-batch-all'

"cat-file" learned "--batch-all-objects" option to enumerate all available objects in the repository more quickly than "rev-list --all --objects" (the output includes unreachable objects, though). * jk/cat-file-batch-all: cat-file: sort and de-dup output of --batch-all-objects cat-file: add --batch-all-objects option cat-file: split batch_one_object into two stages cat-file: stop returning value from batch_one_object cat-file: add --buffer option cat-file: move batch_options definition to top of file cat-file: minor style fix in options list