Nu Weekly Update #25: Scripting, Flags, and Performance Improvements

1st chunk of `blog/2020-02-14-twin0025.md`

2e10255719e9d43648a8682a2d04b2742aaa0df3e87c221d0000000100000418

# This week in Nu #25

Don't read this list if want a surprise for next week's release

- thegedge and jonathandturner added support for running scripts (#1368, #1386)
- Amanita-muscaria added support for shorthand flags, letting you type `ls -f` instead of `ls --full`, for example (#1384)
- Amanita-muscaria also added support for parsing datetime strings (#1381)
- andrasio fixed Nu to warn if a command is given an incorrect flag (#1383)
- andrasio also added support for using the `$nu` variable when calling external commands (#1379), allowing flags anywhere in command (#1375), ensures the full set of stable plugins is installed with `--features=stable`(#1373)
- coolshaurya added a new error when running `calc` on divide by zero (#1376)
- notryanb added more code documentation (#1366)
- jonathandturner added support for running commands from outside nu with `-c`(#1361, #1367)
- thegedge fixed a major performance issue with running external commands (#1358)
- UltraWelfare fixed an issue where `mv` was given an incorrect path (#1351)

Title: Nu Weekly Update #25: Scripting, Flags, and Performance Improvements

Summary

This week's Nu update includes support for running scripts and shorthand flags, datetime string parsing, and warnings for incorrect command flags. The update also features fixes for division by zero errors in `calc`, improved code documentation, and the ability to run commands from outside Nu. A major performance issue with running external commands and an incorrect path issue in `mv` were also resolved.