[AgileWiki] More brace notation

[Bill la F. <bil...@su...>]

I finally realized that we do not have any brace notation for running 
commands. Instead, we've got things like
    sb.append("<a href=\"AwServlet?cmd=register\" 
target=\"_top\">register</a>.");
to generate them for special cases.

So we need something like this: {text|`command}

Bill