Every style sheet has both a key, and a name. The name can be clean and
beautiful, with any character you might want. The key is in fact the
prefix part of the file name, and is alpha-numerical, lower case, and
less than 8 characters long.
Anywhere a2ps needs to recognize a style sheet by a name, it
uses the key (in the `sheets.map' file, with the option `-E',
etc.).
As an example, C++ is implemented in a file called `cxx.ssh', in
which the name is declared to be `C++'.
The rationale is that not every system accepts any character in the file
name (e.g., no `+' in MS-DOS). Moreover, it allows to make
symbolic links on the ssh files (e.g., `ln -s cxx.ssh c++.ssh'
let's you use `-E c++').
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