LaTeX-style \sqrt[]{}

Fix LaTeX macros so that both (TeX-style)
\root{}{} and (LaTeX-style) \sqrt[]{} can
appear in the same file. The latter will be
supported in the next version of itex2MML.

app/views/wiki/tex.rhtml

@@ -97,6 +97,7 @@
 % Renames \sqrt as \oldsqrt and redefine root to result in \sqrt[#1]{#2}
 \let\oldroot\root
 \def\root#1#2{\oldroot #1 \of{#2}}
+\renewcommand{\sqrt}[2][]{\oldroot #1 \of{#2}}
 
 % Manually declare the txfonts symbolsC font
 \DeclareSymbolFont{symbolsC}{U}{txsyc}{m}{n}

test/functional/wiki_controller_test.rb

@@ -142,6 +142,7 @@ class WikiControllerTest < ActionController::TestCase
     
     # Tempfile doesn't know how to open files with binary flag, hence the two-step process
     Tempfile.open('instiki_export_file') { |f| @tempfile_path = f.path }
+    @tempfile_path.to_s
     begin 
       File.open(@tempfile_path, 'wb') { |f| f.write(r.body); @exported_file = f.path }
       Zip::ZipFile.open(@exported_file) do |zip| 
@@ -1141,6 +1142,7 @@ class WikiControllerTest < ActionController::TestCase
 % Renames  \sqrt as \oldsqrt and redefine root to result in \sqrt[#1]{#2}
 \let\oldroot\root
 \def\root#1#2{\oldroot #1 \of{#2}}
+\renewcommand{\sqrt}[2][]{\oldroot #1 \of{#2}}
 
 % Manually  declare the txfonts symbolsC font
 \DeclareSymbolFont{symbolsC}{U}{txsyc}{m}{n}