fixed permissions check for executable files exported on systems where 'ls' reports alternative access characters
<html><head><meta http-equiv="Content-Language" content="en-us"><!--<link rel="stylesheet" type="text/css" href="stylesheets/style.css">--><title>Helium Documentation Index</title></head><body> <div style="font-family:arial"> <h1>Helium Documentation</h1> <a href="../build/doc/index.html">Helium Documentation</a> <p/> If this link does not work, please run <tt>hlm docs</tt> from the <tt>/helium</tt> directory and try again. <p/> The main Helium documentation is HTML generated from the RST text documents. </div></body></html>