/**
     * 
     * Initialize a class within the core class (as $wv->class)
     * 
     * Mandatory parameters:
     * class_name (cname): Must match the real class name.
     * 
     * Optional parameters:
     * class_init_name (iname): Initialize class as alternative name, i.e. $wv->newname
     * class_parameters (param): Init a class with supplied parameters, if "class_this" 
     *                   is true, the class parameters are loaded as
     *                   $this->class_parameters (inside the $this)
     * class_this (this): If true, init class with $this as parameter
     * file_path (path): File path. If empty the file name is searched in local lib
     *            first and then in framework dir. If $wv_path is true, local
     *            lib path will be ignored (too speedup loading).
     * file_name (fname): Class file name. If file extension is ommited the ending .php
     *            will be added. If empty, it will try to load first 
     *            class_{class_name}.php from local lib, if it fails, this class
     *            is recalled with $wv_path=1 to try the loading from framework
     *            lib directory as wv_{class_name}.php
     * force_nh_load (fnh): Force class loading from pages with "No-heades"
     * block_nh_load (bnh): Block class loading from pages with "No-heades"
     * local_dir: true to init local clases from conf_framework file
     * loading_error: Used internally to send first class loading error when
     *                trying to load from local lib directory, to return joined
     *                with the error, if class loading from framewok also fails.
     * 
     * 
     * @param array $_init_class Info of classes to be initialized
     * @param bool $wv_path try to load first from framework lib directory
     */