Merge branch 'jh/checkout-auto-tracking' into maint

"git branch --track" had a minor regression in v1.8.3.2 and later that made it impossible to base your local work on anything but a local branch of the upstream repository you are tracking from. * jh/checkout-auto-tracking: t3200: fix failure on case-insensitive filesystems branch.c: Relax unnecessary requirement on upstream's remote ref name t3200: Add test demonstrating minor regression in 41c21f2 Refer to branch.<name>.remote/merge when documenting --track t3200: Minor fix when preparing for tracking failure t2024: Fix &&-chaining and a couple of typos