Upgrade to the latest DDOX with underscore_file_name_support.
Add a URL translation tool to be used with mod_rewrite.

This tool converts URLs of the form "/library/some/module/SomeSymbol.html" to
"/library/some/module/some_symbol.html", suitable to be used as a
"RewriteMap prg:" script.
Merge pull request #132 from s-ludwig/master

Use new DDOX version to enable support for lower_underscore file names