Letter module for ConTeXt.

The module and all included files are copyright of Wolfgang
Schuster and published under public domain.

The letter module provides a environment to write private
and business letters.

Style files are responsible for the layout of the letter,
the command \setupletterstyle could be used to change the
default to own preferences.

Besides the default interface another two are include in
the bundle, you have to load either with the module or in
the document with \useletterinterface.