Started with Group_Ldap (not yet ready)

Started with Group_Ldap (not yet ready)
added new _AuthInfo plugin to help in auth problems (warning: may display passwords)
fixed some configurator vars
renamed LDAP_AUTH_SEARCH to LDAP_BASE_DN
changed PHPWIKI_VERSION from 1.3.8a to 1.3.8pre
USE_DB_SESSION defaults to true on SQL
changed GROUP_METHOD definition to string, not constants
changed sample user DBAuthParams from UPDATE to REPLACE to be able to
  create users. (Not to be used with external databases generally, but
  with the default internal user table)

fixed the IndexAsConfigProblem logic. this was flawed:
  scripts which are the same virtual path defined their own lib/main call
  (hmm, have to test this better, phpwiki.sf.net/demo works again)

git-svn-id: svn://svn.code.sf.net/p/phpwiki/code/trunk@2974 96ab9672-09ca-45d6-a79d-3d69d39ca109