Added auth_api: CMS_AUTHENTICATION_API, and for now moved registration instructions inside.

Added authentication module webapi, to provide registration via webapi.
Improved the roles display by providing table of permissions if asked.
Added various links in primary tabs to navigate back to roles or users, depending on the page.
Added datetime to-from string converters in CMS_ENCODERS.
Start removing CMS_ADMINISTRABLE.
Added permission to use simple core access token.
Added webapi for users: list, new, register.

modules/auth/cms_authentication_api.e

@@ -0,0 +1,68 @@
+note
+	description: "Summary description for {CMS_AUTHENTICATION_API}."
+	author: ""
+	date: "$Date$"
+	revision: "$Revision$"
+
+class
+	CMS_AUTHENTICATION_API
+
+inherit
+	CMS_AUTH_API_I
+
+create {CMS_AUTHENTICATION_MODULE}
+	make
+
+feature -- Token Generation
+
+	register_user (u: CMS_TEMP_USER; a_email: READABLE_STRING_8; a_personal_information: READABLE_STRING_8)
+		local
+			l_user_api: CMS_USER_API
+			l_url_activate: STRING
+			l_url_reject: STRING
+			l_token: STRING
+			es: CMS_AUTHENTICATION_EMAIL_SERVICE
+		do
+			l_user_api := cms_api.user_api
+			l_user_api.new_temp_user (u)
+				-- Create activation token
+			l_token := new_token
+			l_user_api.new_activation (l_token, u.id)
+			l_url_activate := cms_api.absolute_url ("/account/activate/" + l_token, void)
+			l_url_reject := cms_api.absolute_url ("/account/reject/" + l_token, Void)
+				-- Send Email to webmaster
+			cms_api.log_debug ("registration", "send_register_email", Void)
+			create es.make (create {CMS_AUTHENTICATION_EMAIL_SERVICE_PARAMETERS}.make (cms_api))
+			es.send_account_evaluation (u, a_personal_information, l_url_activate, l_url_reject, cms_api.absolute_url ("", Void))
+
+				-- Send Email to user
+			cms_api.log_debug ("registration", "send_contact_email", Void)
+			create es.make (create {CMS_AUTHENTICATION_EMAIL_SERVICE_PARAMETERS}.make (cms_api))
+			es.send_contact_email (a_email, u, cms_api.absolute_url ("", Void))
+
+			cms_api.log ("registration", {STRING_32} "new user %"" + u.name + "%" <" + a_email + ">", {CMS_LOG}.level_info, Void)
+		end
+
+	new_token: STRING
+			-- Generate a new token activation token
+		local
+			l_token: STRING
+			l_security: SECURITY_PROVIDER
+			l_encode: URL_ENCODER
+		do
+			create l_security
+			l_token := l_security.token
+			create l_encode
+			from
+			until
+				l_token.same_string (l_encode.encoded_string (l_token))
+			loop
+					-- Loop ensure that we have a security token that does not contain characters that need encoding.
+					-- We cannot simply to an encode-decode because the email sent to the user will contain an encoded token
+					-- but the user will need to use an unencoded token if activation has to be done manually.
+				l_token := l_security.token
+			end
+			Result := l_token
+		end
+
+end