Fixes since v1.8.5.1:
* "git diff -- ':(icase)makefile'" was unnecessarily rejected at the
command line parser.
* "git cat-file --batch-check=ok" did not check the existence of
the named object.
* "git am --abort" sometimes complained about not being able to write
a tree with an 0{40} object in it.
* Two processes creating loose objects at the same time could have
failed unnecessarily when the name of their new objects started
with the same byte value, due to a race condition.
Also contains typofixes, documentation updates and trivial code clean-ups.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
