Simplify CMS_SERVICE initialization, and CMS server (launcher).

Renamed "layout" lib as "app_env" with APPLICATION_ENVIRONMENT interface.
  applied changed to callers.
Added CMS_THEME.has_region (a_name): BOOLEAN to know if a region is declared in a defined theme.

src/configuration/cms_environment.e

@@ -0,0 +1,65 @@
+note
+	description: "[
+				CMS Environment providing file system locations for
+						- config 
+						- application 
+						- logs 
+						- documentation 
+						- themes
+			]"
+	date: "$Date: 2015-03-09 19:25:49 +0100 (lun., 09 mars 2015) $"
+	revision: "$Revision: 96797 $"
+
+class
+	CMS_ENVIRONMENT
+
+inherit
+	APPLICATION_ENVIRONMENT
+
+create
+	make_default,
+	make_with_path,
+	make_with_directory_name
+
+feature -- Access
+
+	theme_path: PATH
+			-- Directory for templates (HTML, etc).
+		local
+			p: detachable PATH
+		do
+			p := internal_theme_path
+			if p = Void then
+				p := www_path.extended ("theme")
+				internal_theme_path := p
+			end
+			Result := p
+		end
+
+	cms_config_ini_path: PATH
+			-- CMS Configuration file path.
+		local
+			p: detachable PATH
+		do
+			p := internal_cms_config_ini_path
+			if p = Void then
+				p := config_path.extended (cms_config_ini_name)
+				internal_cms_config_ini_path := p
+			end
+			Result := p
+		end
+
+	cms_config_ini_name: STRING
+			-- CMS Configuration file name.
+			-- Redefine to easily change the name.
+		do
+			Result := "cms.ini"
+		end
+
+feature {NONE} -- Implementation
+
+	internal_theme_path: detachable like theme_path
+
+	internal_cms_config_ini_path: detachable like cms_config_ini_path
+
+end