some new gitalias features

[kobusjooste]

I found these additions helpful. Feel free to cherry-pick. Or not.

[joelparkerhenderson]

Good ideas, thank you. I especially appreciate that you're working with the existing formatting and intention, because these aliases are widespread among many companies.

Here's what I'm adding now, to match up with what you're suggesting:

# branch verbose: When in list mode, show sha1, commit subject line, relationship, etc.
bv = branch --verbose

# branch verbose x2: When in list mode, show path, upstream branch, etc.
bvv = branch --verbose --verbose

# fetch all - fetch all remotes.
fa = fetch --all

# fetch all verbose - fetch all remotes, with verbose output.
fav = fetch --all --verbose

I'll respectfully decline your suggestions of changing abort from just a to ab, because of the goal of having each letter expand to one word. I see your amend item, and I agree that's likely a better use of rebase rba; however, there's no obvious way to adjust that one, given the existing widespread deployment and goal of continuity.

The status --short is explicit because it in practice, what I've seen is some teams override the word status to do other kinds of log status. In other words.

I'll take a closer look at your other suggestions soon, when I have a bit more time. I very much appreciate you doing this PR and making so many good additions. Thanks!