Added weight into to the CMS_LINK and provide a `sort' feature for CMS_MENU and related.

Protected cms service from registering many time the same module type.
Moved library/persistence/implementation/* under library/persistence/.
Moved site/www/themes to site/themes
For SQLite storage driver, auto create sqlite db file using associated sql script (to be completed).
Added code in demo module to reuse storage for module purpose.
Always call sql_post_execution in sql_query and sql_change, and not anymore by the callers.
Removed is_web and is_html from {CMS_SETUP}, it was not used.
Reused SHARED_*_ENCODER in CMS_ENCODERS
Added CMS_API.logger rather than using directly the SHARED_LOGGER.log ...
Centralize the implementation of current_user in CMS_REQUEST_UTIL
Removed the inheritance on WSF_FILTER for node handlers, since it is useless and unused.
Added CMS_NODE_API and CMS_USER_API
Prefix html id for block generated html items with "block-", to avoid css name conflict on "main", "content" or similar.
Code cleaning

src/service/response/cms_response.e

@@ -1,7 +1,7 @@
 note
 	description: "Generic CMS Response.It builds the content to get process to render the output"
-	date: "$Date: 2014-12-15 21:43:38 +0100 (lun., 15 déc. 2014) $"
-	revision: "$Revision: 96346 $"
+	date: "$Date: 2015-02-13 13:08:13 +0100 (ven., 13 févr. 2015) $"
+	revision: "$Revision: 96616 $"
 
 deferred class
 	CMS_RESPONSE
@@ -357,7 +357,6 @@ feature -- Blocks regions
 			end
 		end
 
-
 feature -- Blocks 		
 
 	add_block (b: CMS_BLOCK; a_default_region: detachable READABLE_STRING_8)
@@ -369,7 +368,6 @@ feature -- Blocks
 			l_region.extend (b)
 		end
 
-
 	get_blocks
 		do
 			debug ("refactor_fixme")
@@ -754,9 +752,13 @@ feature -- Element Change
 feature -- Generation
 
 	prepare (page: CMS_HTML_PAGE)
+		local
+			lnk: CMS_LINK
 		do
 				-- Menu
-			add_to_primary_menu (create {CMS_LOCAL_LINK}.make ("Home", "/"))
+			create {CMS_LOCAL_LINK} lnk.make ("Home", "/")
+			lnk.set_weight (-10)
+			add_to_primary_menu (lnk)
 			invoke_menu_system_alter (menu_system)
 			prepare_menu_system (menu_system)
 
@@ -774,6 +776,11 @@ feature -- Generation
 				end
 			end
 
+				-- Sort items
+			across menu_system as ic loop
+				ic.item.sort
+			end
+
 				-- Values
 			common_prepare (page)
 			custom_prepare (page)
@@ -843,10 +850,6 @@ feature -- Generation
 			page.register_variable (title, "site_title")
 			page.set_is_front (is_front)
 
-				-- Variables/Setup
-			page.register_variable (setup.is_web, "web")
-			page.register_variable (setup.is_html, "html")
-
 				-- Variables/Misc
 
 -- FIXME: logo .. could be a settings of theme, managed by admin front-end/database.