chktex warnings on some tex constructs used by lyx

[Kornel Benko]

Here are some examples used in Additional.lyx (to be seen in Additional.tex)
        features of \LaTeX .
                You ought to remove spaces in front of punctuation.
        heavily on \LyX 's interaction
                Use ` to begin quotation, not '.
        HTML. And lastly, there's 
                Intersentence spacing (`\@') should perhaps be used.
        This~...~~\\
                 You should use \ldots to achieve an ellipsis.
        (see section~\ref{sec:Inserting-TeX-Code}),
                User Regex: 1:Capitalize before references.
        \noindent\shadowbox{\begin{minipage}[t]{1\columnwidth - 2\fboxsep - 
2\fboxrule - \shadowsize}%
                Wrong length of dash may have been used.

This is of course only a subset of warnings, omitting following similar 
messages.

        Kornel

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