[AUCTeX] Checking whether a package is loaded

[Alexander,J]

Are there any functions provided by AUCTeX that allow one to check whether a 
particular package is loaded?  I've written a yasnippet which inserts a payoff 
matrix using the "game" environment as defined by sgame.sty or sgamevar.sty -- 
except these two macro packages use slightly different syntax. The first uses 
"&" as the column separator (just like tabular) but the latter uses "\>". It 
would be nice to be able to automatically detect which package was loaded via 
\usepackage so as to just do the right thing without any further input from the 
user. 

Best wishes,

Jason

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