Writers are not stored so instantiated several times.

Put a self halt in MicSBALatexWriter as follows

```
new
	self halt.
	^ super new
```

and 
something like that when you are in development mode

```
..../Documents/Pharo/vms/130-x64/Pharo.app/Contents/MacOS/Pharo ..../Documents/Pharo/images/P13-Pillar/P13-Pillar.image clap build pdf index.md
```