No christmas trees in E4

- Bugfix for http://bugs.eressea.de/view.php?id=2019
- removing some old tests

scripts/eressea/e4/init.lua

@@ -4,7 +4,6 @@ print("rules for game E3")
 
 return {
     require('eressea'),
-    require('eressea.xmas2009'),
     require('eressea.markets'),
     require('eressea.frost'),
     require('eressea.ents')

scripts/tests/init.lua

@@ -8,8 +8,3 @@ require 'tests.regions'
 require 'tests.study'
 require 'tests.movement'
 
--- require 'tests.bugs'
--- require 'tests.building'
--- require 'tests.castles'
--- require 'tests.spells'
--- require 'tests.ships'