fetch: don't ask for remote HEAD if followRemoteHEAD is "never"

Merge branch 'jk/zlib-errors' into HEAD

add blame-tree command [ci skip]

rev-parse: clean up funky git-dir cwd handling

show: skip diff when possible

unpack-objects: drop -r option

oidmap: drop pointer check from clear

t5000: drop tag to supposedly unreachable object

log: add --commit-header option

tweaking split pattern [ci skip]

diff: ignore mode in binary size optimization

tree-diff: use pathspec tries

use nodup + mkpathdup

wip

config.mak.dev: disable -Wunreachable-code on macOS

commit: give a hint when a commit message has been abandoned

wip -- better protection against corruption

extra warning hack

run-command: terrible hack for loading config

fast-export: leave warnings to revision code

diff: enable autoencode by default

test-tree-bitmap: replace ewah with custom rle encoding

test updates

clone: give advice on how to resume a failed clone [ci skip]

Merge branch 'tb/fetch-follow-tags-fix' into HEAD

receive-pack: disable hook advice in "quiet" mode

pager_in_use: make sure output is still going to pager

more tests

blame-tree: porcelain option wip [ci skip]