Installation of s-tui and of the stress test: pipx

### Step 1: Describe your environment

* AMD Rhyzen 7040 series
* OS version: Mint 22
* s-tui version: 1.1.6
* Installation method(pip/PPA/source code): `pipx install s-tui`

### Step 2: Describe the problem

Trying to install with _pip_ produced an 'externally managed environment' error.

Installing with _pipx_ worked - but, subsequently, within s-tui 'install stress' was marked as 'na'. The latter situation might be because I had not run s-tui as root. But how _does_ one run a pipx-installed program as root? (`sudo s-tui` yields 'command not found').