chenged structure of breadcrumbs array fix 2 [2.7.2]

This version introduces multiple enhancements:

added main page (index) to breadcrumbs

Details of additions/deletions below:
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Modified:   /BLUE_FRAMEWORK/packages/CORE/tree_class.php
            -- Added --
                _setBreadcrumbsMainPage to set at list first main page
            -- Updated --
                _load to use new _setBreadcrumbsMainPage  method