git-arc: Handle -h on subcommands and align usage with the man pageHEADmain

git-sh-setup treats -h as help against an empty USAGE, so
"git arc create -h" prints "usage: git arc". Handle -h before
sourcing it so every subcommand prints the real synopsis.

The create, stage, and update synopses showed optional commit-refs
while git-arc(1) and the code require them. Advertise -p parent on
create; the option was already implemented and documented.

Sort create sub-command option-arguments alphabetically in three
places: (1) synopsis from tool, (2) man-page synopsis, and (3)
man-page description.

Check for jq(1) / arc after checking for usage so -h always works.

While here, fix missing "local o" in gitarc__stage().

Reviewed by:	markj
Differential Revision:	https://reviews.freebsd.org/D59129

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