#17 latex formatter patch again:)

[Árpád, Magosányi]

Now the latex formatter is as functional as I want it
to be.

Also this patch is clean and tested to work.

(There is a little modification to fileformatterbase
which makes the default formatter with default docset
work, and I guess not the scope of this patch. Check
that part twice, because I did not know what I am
doing. [And even did not care:])

What will follow:

-maybe find a better place for texbase.py?

-detach the latex file header from the source, it
should be a separate file given to the formatter as an
option.

-rework the *X docsets to generate a DOM structure
and decorate that

-tidy up the TexClass to have an uniform interface
(and be able to handle the formatter-specific states)

-rewrite the classic ST code to use DOM (later), and
have a real Classic ST in the Latex formatter.

[Árpád, Magosányi]

why should I always separately attach the file?