Add $TBMAINSITE variable, defaults to 0 but is 1 in the main defs

file. Controls whether we spit out the keywords and the emu page,
since we do not want anyone but else getting the links.

www/default-defs.php3

@@ -10,6 +10,7 @@ $TBWWW          = "<$TBBASE/>";
 $TBAUTHDOMAIN   = ".emulab.net";
 $TBSECURECOOKIES= 1;
 $TBCOOKIESUFFIX = "";
+$TBMAINSITE     = 1;
 
 #
 # Title Page stuff.

www/stoller-home-defs.php3

@@ -10,6 +10,7 @@ $TBWWW          = "<$TBBASE/>";
 $TBAUTHDOMAIN   = ".ballmoss.com";
 $TBSECURECOOKIES= 0;
 $TBCOOKIESUFFIX = "";
+$TBMAINSITE     = 0;
 
 #
 # Title Page stuff.