Changes to BC and behavior in version 4.7.0

Changes to BC and behavior in version 4.7.0
===========================================

INI setting changes
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- Revamped cluster index mechanism

  The cluster index system, used to serve images & binary files when running Exponential
  in cluster mode, has been revamped completely. Settings are now to be placed in
  config.php, and have slightly different names (they all start with CLUSTER_, for one).
  Documentation on how to configure the new version is available online.
  All index_cluster_* & index_image_* files are to be removed from the document root.
  Backend specific files are now located in kernel/clustering.

  Note that if using eZDB cluster, HTTP_RANGE support should be explicitely disabled by
  setting CLUSTER_ENABLE_HTTP_RANGE constant to false.

- LogDir=log/audit

  Default log dir has changed and from now will always be relative to VarDir setting.

Change of behavior
------------------

- #019024: Mixed up class attribute IDs after re-order

  Content class edit form inputs have been changed for class attributes.
  They are now indexed by attribute ID instead of raw numeric index.
  Override templates for *content/class/edit.tpl* must thus be changed in the same way.

- #019215: Audit feature should be improved for multisite installations

  From now, default log storage will be relative to VarDir setting. This is specially
  useful if you have a multisite installation, probably using two or more databases.
  This way you can have separate audit logs per website.

- ezpMvcRailsRoute now forces you to be explicit on what kind of http method is used.

  By default http-get is now assumed so if your rails route uses anyting else you would need to change it.
  Two options:
  * Use ezcMvcRailsRoute instead, it behaves like ezpMvcRailsRoute used to and works on 4.5 and up
  * Change your route configuration:
   - 'oauthToken'   => new ezpMvcRailsRoute( '/oauth/token', 'ezpRestOauthTokenController', 'handleRequest' )
   + 'oauthToken'   => new ezpMvcRailsRoute( '/oauth/token', 'ezpRestOauthTokenController', array( 'http-post' => 'handleRequest' ) )



Removed features
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Removed constants
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Removed globals
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Deprecated
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- eZSession::get() and eZHTTPTool->sessionVariable()

  These functions will not return session value by reference in the future,
  please adapt your code to be explicit and use the set() / setSessionVariable().