[TxMt] Beamer requests

[Mark Eli Kalderon]

A couple requests about beamer support.

First, highlight and smart typing pairs should include the ones  
supported in LaTeX. So Miscellaneous (Beamer) should be:

{	highlightPairs = (
		( '<', '>' ),
		( '"', '"' ),
		( '(', ')' ),
		( '{', '}' ),
		( '[', ']' ),
		( '“', '”' ),
		( '$', '$' ),
		( '`', "'" ),
	);
	smartTypingPairs = (
		( '<', '>' ),
		( '"', '"' ),
		( '(', ')' ),
		( '{', '}' ),
		( '[', ']' ),
		( '“', '”' ),
		( '$', '$' ),
		( '`', "'" ),
	);
}

Second, it would be nice to support the overprint environment in  
which \onslide functions similarly to \item. Specifically, it would  
be useful to hit enter and to create another \onslide. \onslide takes  
a number between angle brackets (e.g., \onslide<3>, *without* a plus  
or minus sign since overprints may not overlap). Another difference  
from \item is that the text begins indented on a new line as in the  
following example:

\begin{overprint}
     \onslide<1>
         lorem
     \onslide<2>
         ipsum
\end{overprint}

Thanks in advance.

All the best, Mark