Renamed node_api and node_storage by blog_api and blog_storage in related CMS_BLOG_* classes. Mainly to avoid confusion with NODE_ classes.

Merged CMS_BLOG_CONFIG with CMS_BLOG_API.
In CMS_BLOG_API, prefer argument of type CMS_USER, rather than using directly user id.
Added a CMS_EDITOR_CONTENT_FORMAT for now, to be the format editable by the WYSIWYG editor.
Added CMS_MODULE.is_initialized: BOOLEAN to equip router, and module_api with expected preconditions.

Fixed typo, especially in log output.
Corrected a few routine names such as add_authors that should not be a function according to its name.
Converted various function returning html content, to procedure appending html content to an output string to minimize temporary string object creation.
Cosmetic: added spaces to make code easier to read, and indentation.

src/kernel/form/cms_editor.e

@@ -27,8 +27,6 @@ feature -- Javascript
 
 	javascript_textarea_to_editor(a_textarea : WSF_FORM_TEXTAREA) : STRING
 			-- Javascript code to display the textarea as a WYSIWIG editor as soon as the document is loaded
-		local
-			l_code : STRING
 		do
 			Result := javascript_ready(javascript_replace_textarea (a_textarea))
 		end