Proposal.sty: the coherencetable remains centered even if it is larger than textwidth

Michael: this is probably not the best way to do that; please review!

base/proposal.sty

@@ -985,16 +985,27 @@ joint&\multicolumn{\the@site}{l|}{\jpub $\hat=$ publication, \jpro $\hat=$ proje
        \jorga $\hat=$ organization, \jsoft $\hat=$ software/resource dev,
        \jsup $\hat=$ supervision}\\\hline
 \end{tabular}}
+
+\newskip\@bigflushglue \@bigflushglue = -100pt plus 1fil
+
+\def\bigcenter{\trivlist \bigcentering\item\relax}
+\def\bigcentering{\let\\\@centercr\rightskip\@bigflushglue%
+\leftskip\@bigflushglue
+\parindent\z@\parfillskip\z@skip}
+\def\endbigcenter{\endtrivlist}
+
 \define@key{coherencetable}{swsites}[true]{\def\cht@swsites{#1}}
 \define@key{coherencetable}{stretch}{\def\cht@stretch{#1}}
 \newcommand\coherencetable[1][]{%
 \def\cht@swsites{false}%
 \def\cht@stretch{1}%
 \setkeys{coherencetable}{#1}%
-\begin{table}[ht]\centering%
+\begin{table}[ht]%
 \small\setlength{\tabcolsep}{.5em}%
 \renewcommand{\arraystretch}{\cht@stretch}%
+\begin{bigcenter}%
 \coherencematrix%
+\end{bigcenter}%
 \caption{\coherence@caption}\label{tab:collaboration}
 \end{table}}
 \newcommand\coherence@caption{Previous Collaboration between {\pn} members}