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This reverts commit 06d52a60.

Plugin command-not-found on Arch Linux returns 0 if git or bzr is found in repos, hence outputting unwanted pkgfile output.
Checking if the commands exist first fixes all such issues.

the agnoster theme is now able to render basic information
if the user is currently residing inside a bazaar folder.
if so, it will render a green promt segment with "bzr" and
the current revision number in it. if there are untracked
files, the bar will be rendered in yellow. if there are
changes to already tracked files, a + character will be
printed.

The ruby prompt info was not interpolating properly. Switching to use
 ruby_prompt_info helper. This addresses the issue.

The parsing output for full git log output too slow so it replaced
with last commit show request, wich cause error if repository is empty

* muse theme: Remove a extra space for none git prompt

* muse theme: Remove a extra space for none virtualenv prompt

adding python virtualenv support to muse theme

This separates the gathering of file status, repository status and
stash.

Now uses 12-hour clock or 24-hour clock depending
on user locale

$CARETCOLOR was not to actually colour the caret, so change to root user
wouldn't show in the prompt. Now both ▶ and ◀ follow $CARETCOLOR.

Make some colours in the avit theme bold for better visibility in the
default Ubuntu terminal theme.

In commit 729fd53 I incorrectly only changed PROMPT1. Now both ▶ and ◀ follow $CARETCOLOR.

oh-my-zsh avit theme: instead of only showing the last 3 directories in the $PWD shorten the path by removing some middle parts if $PWD becomes too long.

Fix in avit theme: $CARETCOLOR was not to actually colour the caret, so change to root user wouldn't show in the prompt.

Fixes #4085: core -> plugin dependency issue.
Rename it to git_current_branch for clarity that it's git-specific.
Update all plugins that were calling it to use new name.
Fix variable leaks by making more variables in lib/git.zsh local.
Have lib/git.zsh use [[ ]] instead of [ ] everywhere.

Actually replace the value of the environment variable $HOME with
"~" instead of appending the tilde in front of the prompt.

When the current path is /home/user/.config/doublecmd the prompt
now reads "/h/u/.c/doublecmd", not "/h/u/./doublecmd" as was the
case. This matches what the Fish shell does.

Enclose the Perl snippet in single quotes instead of double quotes.

I noticed that for certain projects with unstaged changed I would get a 'U' character instead of the '●' character. This should fix that.

Fix «rvm» variable usage in RPROMPT out