Backported changes from default.latex to default.beamer in order to improve Unicode support

default.beamer

@@ -11,17 +11,27 @@ $endif$
 \usepackage{amssymb,amsmath}
 \usepackage{ifxetex,ifluatex}
 \usepackage{fixltx2e} % provides \textsubscript
+\IfFileExists{upquote.sty}{\usepackage{upquote}}{}
+\usepackage{lmodern}
 \ifxetex
   \usepackage{fontspec,xltxtra,xunicode}
   \defaultfontfeatures{Mapping=tex-text,Scale=MatchLowercase}
+  \newcommand{\euro}{€}
 \else
   \ifluatex
     \usepackage{fontspec}
     \defaultfontfeatures{Mapping=tex-text,Scale=MatchLowercase}
+    \newcommand{\euro}{€}
   \else
+    \usepackage[T1]{fontenc}
     \usepackage[utf8]{inputenc}
+    $if(euro)$
+      \usepackage{eurosym}
+    $endif$
   \fi
 \fi
+% use microtype if available
+\IfFileExists{microtype.sty}{\usepackage{microtype}}{}
 $if(natbib)$
 \usepackage{natbib}
 \bibliographystyle{plainnat}