Update changelog and RELEASE_NOTES

RELEASE_NOTES

@@ -20,9 +20,9 @@ Users of Wesnoth 1.5.0 are encouraged to upgrade since Wesnoth 1.5.0 won't be
 compatible with recent changes to the addon server.
 
 "Host Network Game" feature in multiplayer menu requires "wesnothd" server to 
-be compiled. Wesnothd is found from same directory as wesnoth was launched with
-default configuration. User can change wesnothd path from userdata/preferences
-using wesnothd_name="/path/to/wesnothd". Windows version is
+be compiled. Wesnothd is looked for by default in the same directory wesnoth was 
+launched from. This can be changed in userdata/preferences by setting 
+wesnothd_name="/path/to/wesnothd". Windows version is 
 wesnothd_name="C:\path\to\wesnothd.exe"
 
 Now content authors can specify the type of their addons. See the documentation
@@ -39,3 +39,6 @@ a completely new [attacks] has been created behaving alike to [damage] and
 [chance_to_hit]. If an attack uses [swarm] any [attacks] declared will be
 ignored.
 
+WML authors can now choose if they want [event] spawned inside an [event] to have
+variables evaluated immediately (new behavior) or at execution time (1.4 one, default) by
+using a delayed_variable_substitution= key. Defaults to yes.

changelog

@@ -105,6 +105,9 @@ Version 1.5.0+svn:
      [damage] special
    * add a warning about future end of support for implicit prefix "units/" in
      images url.
+   * add a switch (delayed_variable_substitution, defaults to 'yes') allowing to 
+	 choose wether variables in [event] spawned inside an [event] are substituted at
+	 spawn or execution time. Fixes bug #11843 introduced by a change in this behavior.
  * wesnothd
    * added selective ping support - saves server bandwidth
    * updated pings to use new simple_wml