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diff --git a/common/latex/environ.sty b/common/latex/environ.sty
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@@ -0,0 +1,145 @@
+%%
+%% This is file `environ.sty',
+%% generated with the docstrip utility.
+%%
+%% The original source files were:
+%%
+%% environ.dtx  (with options: `package')
+%% 
+%%   __________________________________
+%%   Copyright (C) 2007  Will Robertson
+%% 
+%%   License information appended.
+%% 
+%% ^^A Test that \RenewEnvironment works correctly:
+\ProvidesPackage{environ}[2014/05/04 v0.3 A new way to define environments]
+\RequirePackage{trimspaces}
+\def\environbodyname#1{\def\env@BODY{#1}}
+\environbodyname\BODY
+\def\environfinalcode#1{%
+  \def\env@finalcode{#1}}
+\environfinalcode{\ignorespacesafterend}
+\def\longdef@c#1{%
+  \expandafter\long\expandafter\def\csname#1\endcsname}
+\unless\ifdefined\collect@body
+  \newtoks\@envbody
+  \def\collect@body#1{%
+    \@envbody{\expandafter#1\expandafter{\the\@envbody}}%
+    \edef\process@envbody{\the\@envbody\noexpand\end{\@currenvir}}%
+    \@envbody={}%
+    \def\begin@stack{b}%
+    \begingroup
+    \expandafter\let\csname\@currenvir\endcsname\collect@@body
+    \edef\process@envbody{%
+      \expandafter\noexpand\csname\@currenvir\endcsname}%
+    \process@envbody
+  }
+  \def\push@begins#1\begin#2{%
+    \ifx\end#2\else
+      b\expandafter\push@begins
+    \fi}
+  \def\addto@envbody#1{%
+    \global\@envbody\expandafter{\the\@envbody#1}}
+  \def\collect@@body#1\end#2{%
+    \edef\begin@stack{%
+      \push@begins#1\begin\end \expandafter\@gobble\begin@stack}%
+    \ifx\@empty\begin@stack
+      \endgroup
+      \@checkend{#2}%
+      \addto@envbody{#1}%
+    \else
+      \addto@envbody{#1\end{#2}}%
+    \fi
+    \process@envbody}
+\fi
+\long\def\Collect@Body#1{%
+  \@envbody{\expandafter#1\expandafter{\the\@envbody}}%
+  \edef\process@envbody{\the\@envbody\noexpand\end{\@currenvir}}%
+  \@envbody={}%
+  \def\begin@stack{b}%
+  \begingroup
+  \expandafter\let\csname\@currenvir\endcsname\Collect@@Body
+  \edef\process@envbody{%
+    \expandafter\noexpand\csname\@currenvir\endcsname}%
+  \process@envbody
+}
+\long\def\Push@Begins#1\begin#2{%
+  \ifx\end#2\else
+    b\expandafter\Push@Begins
+  \fi}
+\long\def\Addto@Envbody#1{%
+  \global\@envbody\expandafter{\the\@envbody#1}}
+\long\def\Collect@@Body#1\end#2{%
+  \edef\begin@stack{%
+    \Push@Begins#1\begin\end\expandafter\@gobble\begin@stack}%
+  \ifx\@empty\begin@stack
+    \endgroup
+    \@checkend{#2}%
+    \Addto@Envbody{#1}%
+  \else
+    \Addto@Envbody{#1\end{#2}}%
+  \fi
+  \process@envbody}
+\def\NewEnviron{%
+  \let\env@newenvironment\newenvironment
+  \env@NewEnviron}
+\def\RenewEnviron{%
+  \let\env@newenvironment\renewenvironment
+  \env@NewEnviron}
+\def\env@NewEnviron#1{%
+  \@ifnextchar[
+    {\env@new@i{#1}}
+    {\env@new@iii{#1}{}}}
+\def\env@new@i#1[#2]{%
+  \@ifnextchar[
+    {\env@new@ii{#1}[#2]}
+    {\env@new@iii{#1}{[#2]}}}
+\def\env@new@ii#1[#2][#3]{%
+  \env@new@iii{#1}{[#2][#3]}}
+\long\def\env@new@iii#1#2#3{%
+  \@temptokena={\env@new{#1}{#2}{#3}}%
+  \@ifnextchar[{%
+    \the\@temptokena
+  }{%
+    \expandafter\the\expandafter
+      \@temptokena\expandafter[\env@finalcode]%
+  }}
+\long\def\env@new#1#2#3[#4]{%
+  \longdef@c{env@#1@BODY\expandafter}\expandafter{\env@BODY}%
+  \env@newenvironment{#1}{%
+    \expandafter\Collect@Body\csname env@#1@parse\endcsname
+  }{#4}%
+  \longdef@c{env@#1@parse}##1{%
+    \csname env@#1@save@env\endcsname##1\env@nil
+    \csname env@#1@process\endcsname##1\env@nil}%
+  \expandafter\let\csname env@#1@save@env\endcsname\relax
+  \expandafter\let\csname env@#1@process\endcsname\relax
+  \expandafter\newcommand
+    \csname env@#1@save@env\endcsname#2{%
+      \expandafter\expandafter\expandafter
+        \env@save\csname env@#1@BODY\endcsname}%
+  \expandafter\newcommand
+    \csname env@#1@process\endcsname#2{#3\env@ignore}%
+}
+\long\def\env@save#1#2\env@nil{%
+  \edef#1{%
+    \unexpanded\expandafter
+      \expandafter\expandafter{\trim@spaces{#2}}}}
+\long\def\env@ignore#1\env@nil{}
+%% 
+%% Copyright (C) 2007-2014 by Will Robertson <wspr81@gmail.com>
+%% 
+%% Distributable under the LaTeX Project Public License,
+%% version 1.3c or higher (your choice). The latest version of
+%% this license is at: http://www.latex-project.org/lppl.txt
+%% 
+%% This work is "maintained" (as per LPPL maintenance status)
+%% by Will Robertson.
+%% 
+%% This work consists of the file  environ.dtx
+%%           and the derived files environ.pdf,
+%%                                 environ.sty, and
+%%                                 environ.ins.
+%% 
+%%
+%% End of file `environ.sty'.