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This is much faster.

Fixes #3305
Signed-off-by: Dariusz Luksza <dariusz@luksza.org>

- 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'.