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Fix "command not found: add-zsh-hook" since #3053 removes `autoload -U add-zsh-hook`

Not everyone uses rvm and the library has already got a function for this.

Add spaces before bullet-points to more easily distinguish them from one another and the rest of the prompt when using smaller font-sizes and do not add a blank line prior to prompt output; if there's a desire for spacing, one can use their terminal's line-height to achieve this.

Fixes #2008.

<B> Designates Bisecting
>M< Designates Merging
>R> Designates Rebasing

re-implemented expired pull request https://github.com/robbyrussell/oh-my-zsh/pull/1759

changed ± to 

clearing up some confusion in issue#1906

agnoster theme was checking if the default virtualenv prompt was turned off and not showing its own... so there was no way to see which virtualenv was selected.

Unlike all other files listed in the themes directory, this file is the only
one that's "doing it's own thing"

See http://www.virtualenv.org/en/latest/index.html\?highlight\=virtual_env_disable_prompt\#activate-script for info regarding this.

This reverts commit baffc3b0.