defaults to the current branch, so "git fetch && git merge @{upstream}"
will be equivalent to "git pull".
+ * "git am --resolved" has a synonym "git am --continue".
+
* "git branch --set-upstream" can be used to update the (surprise!) upstream,
i.e. where the branch is supposed to pull and merge from (or rebase onto).
the branch is fully merged to its upstream branch if it is not merged
to the current branch. It now deletes it in such a case.
+ * "fiter-branch" command incorrectly said --prune-empty and --filter-commit
+ were incompatible; the latter should be read as --commit-filter.
+
* When using "git status" or asking "git diff" to compare the work tree
with something, they used to consider that a checked-out submodule with
uncommitted changes is not modified; this could cause people to forget