Change paths in display class (issue #11)
This version introduces multiple enhancements:

Modified display_class to use it independent.
Now can be runned in module and load any template to be rendered.
Also fixes some small errors.

Details of additions/deletions below:
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Modified:   /BLUE_FRAMEWORK/packages/CORE/display_class.php
            -- Added --
               $_defaultOptions to store all given i constructor options
               _constructMainLayout to creat template for basic version of display_class
               _checkTemplatePath to return path for module, core or independent template
            -- Modified --
               __construct to use possibility tu use class independent
               layout to use _checkTemplatePath to return correct path
               all private methods converted to protected
               _external fixed used external templates
               fixed some documentation part and code conventions

Modified:   /BLUE_FRAMEWORK/packages/CORE/core_class.php
            -- Modified --
               _htmlPage and _otherPage methods to use new version of display_class

Modified:   /BLUE_FRAMEWORK/packages/CORE/error_class.php
            -- Modified --
               __construct and render methods to use new version of display_class