#858 awstats will use " " in XHTML output

[Sergey Kirpichev]

When configured to output XHTML, awstats will use " " in the resulting
output file. This isn't a valid XHTML entity and causes awstats to fail to
render under some browsers (Firefox 3.6 in Ubuntu, though apparently not
Iceweasel in Debian). Running the awstats output through the W3C XHTML validator
also seemed to show other issues. // Francis Russell

Simple fix is to replace all   to $somevar, while
$somevar=" " for HTML output and $somevar=" " for XHTML.

See also: http://bugs.debian.org/607204