Site metadata tags in status_network: single 'tags' field, pipe-separated.

Site metadata tags in status_network: single 'tags' field, pipe-separated.
$sn->tags() returns tag list as array; $sn->hasTag('blah') to check for a particular tag only

Could be used to control things in config file:

  $sn = Status_network::setupSite($_server, $_path, $_wildcard);
  if (!$sn) { die("No such site"); }
  if ($sn->hasTag('individual')) { /* blah */ }

Note memcached keys are unchanged; if tags are changed from an external tool clear:
  statusnet:<dbname>:status_network:<key>:<val>
  for <key>s 'nickname', 'hostname', and 'pathname'