php5 workaround code (plus some interim debugging code in XmlElement)

php5 workaround code (plus some interim debugging code in XmlElement)
  php5 doesn't work yet with the current XmlElement class constructors,
  WikiUserNew does work better than php4.
rewrote WikiUserNew user upgrading to ease php5 update
fixed pref handling in WikiUserNew
added Email Notification
added simple Email verification
removed emailVerify userpref subclass: just a email property
changed pref binary storage layout: numarray => hash of non default values
print optimize message only if really done.
forced new cookie policy: delete pref cookies, use only WIKI_ID as plain string.
  prefs should be stored in db or homepage, besides the current session.

git-svn-id: svn://svn.code.sf.net/p/phpwiki/code/trunk@3206 96ab9672-09ca-45d6-a79d-3d69d39ca109