Change the latex prefix and suffix of all note types
Rationale
After two years of using anki, mostly for mathematics, it never
occured that the latex configuration I use depends on the note
type.
So I added a button which allows you to set all footers and
headers to the same value.

Warning
If you change prefix/suffix directly in a note type's option, this
modification will be lost the first time you use this add-on again.
Configuration
Just edit footer/header as you usually do. And click the button if you
want to apply the change everywhere.
Internal
Version 1 used two global configurations "latexPre" and
"latexPost". If they are found, they are deleted when anki start, and
replaced by configurations.
Version 2.0
Anki 2.0 does not have configuration manager. Instead, to use it:
- In main browser
- Select "change LaTeX"
- Enter the LaTeX header
- Enter the LaTeX footer
Links, licence and credits