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This adds "jhsh" as an alias for "jhbuild shell" to the JHBuild plugin.

Closes #4807

Current state: a user invokes `ipython` and is provided with the IPython
instance regarding the `$PATH`.

Proposed state: a user invokes `ipython` (which is a new alias in the
*python plugin*) and is provided with the proper IPython instance regarding
the currently activated virtualenv.

Example: the user's default Python is 2.7 with installed IPython 2.7. User
activates Python 3.5 virtualenv where he installs IPython 3.5. After
activating the environment, one expects `ipython` to run the version 3.5,
which does not happen by default. Instead, IPython 2.7 is used, which in
counter-intuitive and often causes problem.

Closes #5797

Fixes #8665

Fixes #8676

The statements for selecting a random theme in oh-my-zsh.sh and the themes
plugin are duplicate. Most people eventually settle on a theme, making those
lines in oh-my-zsh.sh superfluous. To address those, it may makes sense to put
the random theme functionality into a theme of its own (since themes are just
zsh scripts.

Co-authored-by: Marc Cornellà <marc.cornella@live.com>

Co-authored-by: Marc Cornellà <marc.cornella@live.com>

- Similarly to the mvn plugin
- Without this fix, the shell crashes in some cases

Co-authored-by: Marc Cornellà <marc.cornella@live.com>

On a system with multiple batteries (like thinkpads) report percentage
and time remaining only for the active battery (the one being
discharged).

Ideally we should report all batteries, but acpi only shows time remaining
for the active battery. Also callers of these functions expect a single
return value. This is still better than reporting 596% remaining (like it
did on my laptop).

For the reference, the output of acpi command with multiple batteries looks
like this:

    Battery 0: Unknown, 5%
    Battery 1: Discharging, 86%, 03:14:04 remaining

- Fix code style
- Fix local definitions
- Don't declare unnecessary variables
- Use `command` before grep

Co-authored-by: Michael Wolman <michael.s.wolman@gmail.com>

- marks printed an error when $MARKPATH didn't exist or didn't have any marks
  in it.
- The CTRL+G key binding overwrote an argument when it couldn't match it to
  an existing mark.

Closes #4661

- Fixes `readlink -e` dependency which isn't supported in macOS
  (fixes #3235).
- Uses native zsh wildcard expansion instead of calls to `ls`.
- Prepends commands with `command` and `builtin` to bypass aliases
  and functions.
- Documents CTRL+G key binding to substitute mark name in the command
  line with the mark path (https://github.com/ohmyzsh/ohmyzsh/pull/2045#issuecomment-22826540).

Inside `pscpu` and `pscpu10` aliases, remove sorting of the header line.

I ran into this issue, looks like maybe a few other people did as well.

https://github.com/jonmosco/kube-ps1/issues/28#issuecomment-359761463
A simple clarification seems helpful.