use THISHOMEBASE in more places to name/brand the current install
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www/aptui/portal_defs.php: put THISHOMEBASE in html title (will be overwritten by portal_mainsite.php for some sites)
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www/menu.php3: "Projects on Emulab" => "Projects on $THISHOMEBASE"
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www/projectlist.php3: "Other projects registered on $THISHOMEBASE"