Merge branch 'maint'

* maint:
Start 1.6.0.5 cycle
Fix pack.packSizeLimit and --max-pack-size handling
checkout: Fix "initial checkout" detection
Remove the period after the git-check-attr summary

Conflicts:
RelNotes

diff --cc Documentation/git-check-attr.txt
Simple merge

diff --cc builtin-checkout.c
Simple merge

diff --cc builtin-pack-objects.c
Simple merge

diff --cc cache.h
Simple merge

diff --cc read-cache.c
Simple merge

diff --cc t/t5300-pack-object.sh
Simple merge