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replaced hardcoded origin/{branch-name} with @{upstream} which gets the upstream branch since git 1.7.0

Since e537ee9d, the reverse-menu-complete keybinding has no longer been
properly bound (it was accidentally bound to the delete key).

This commit again binds it to shift-tab.

Fixes formatting on some rare cases when a percent ends up
in the $CMD variable, like these below:

- When assigning a variable, $CMD ends up with the second parameter;
in this case, $CMD will contain '+%s%N', messing with the syntax:

 $ a=`date +%s%N`

- A function (or command in general) that contains a percent symbol:

 $ to\%() { echo $(( $1 * 100 / $3))\% } # $CMD=to%()
 $ to% 2 of 10 # $CMD=to%

Fixes #2641, #2642

Especially given the inc_append_history option, it is not necessary to
set the (default) append_history option.

Fixes #2641, #2642

Delete key (of Fn+Delete on Mac) would print "~" instead of deletion.

Aligned comments

Signed-off-by: Mariusz Fik <fisiu@opensuse.org>

The manual configuration of ':completion:*:hosts' causes some problems
(e.g. issue #1337), and misses useful information (especially from
~/.ssh/known_hosts; issue #690 and issue #1009).

The best option appears to be using zsh's default configuration for
':completion:*:hosts'.

While rebasing this for a new pull request (#1498 got closed by accident
and then requests to re-open it got ignored), it also drops the `users
off` setting: completion of user names can be useful, and the commit
adding it (c4434d2d) does not state why.

Those aliases should be in user's .zshrc file, instead of being default.

Fixes #2182

$HIST_STAMP breaks zsh_stats. see #2501

Just activate word-splitting.

- Allows for the user to turn on auto-correction using the
$ENABLE_CORRECTION variable
- Adds aliases regardless of variable assignment to aid users that use
setopt to turn correction back on in their zshrc