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Revert cab1ac6e

The change from the above commit breaks opening a new emacs frame if
there isn't a existing frame open.

When emacs is running in daemon mode, there will always be a frame
associated with the daemon, even if there are no visible frames.

The lisp function `frame-list`, will always return 1 frame.
```
emacsclient --eval '(frame-list)'
(#<frame F1 0xa3c680>)
```

When an real frame is open, two frames are reported by the `frame-list`
function.
```
emacsclient --eval '(frame-list)'
(#<frame F1 0xa3c680> #<frame emacs Prelude - ~/oh-my-zsh/plugins/emacs/emacsclient.sh 0xf50e10>)
```

See:
https://emacs.stackexchange.com/questions/44537/extra-frame-in-visible-frame-list-when-started-in-daemon-mode-is-causing-prob
https://emacs.stackexchange.com/questions/18859/dont-let-the-daemon-frame-make-a-file-visible

Fixes #5779
Fixes #5405

- Updated minimal version from 23 to 24.
- Added new aliases that fix unexpected close with -nw option.
- Removed some old aliases.
- Fixed line that detects open frames.

* `function` keyword removed
 * Fixup the `if` statement and operators

Emacs returns either a sequence of availbale displays or nil. Checking
nil fixes this script to work as expected.

- Add new function `ecd'.