Merge branch 'maint'

* maint:
clean: remove redundant variable baselen
Documentation/git-pull: clarify configuration
Document that rev-list --graph triggers parent rewriting.
clean: avoid quoting twice
document sigchain api
Keep together options controlling the behaviour of diffcore-rename.
t3402: test "rebase -s<strategy> -X<opt>"

diff --cc Documentation/diff-options.txt
Simple merge