Let the user choose when deleting issues with reported hours (closes #734, #71):

* to delete the hours
* to assign the hours to the project
* to reassign the hours to another issue


git-svn-id: http://redmine.rubyforge.org/svn/trunk@1182 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/issue.rb

@@ -27,7 +27,7 @@ class Issue < ActiveRecord::Base
 
   has_many :journals, :as => :journalized, :dependent => :destroy
   has_many :attachments, :as => :container, :dependent => :destroy
-  has_many :time_entries, :dependent => :nullify
+  has_many :time_entries, :dependent => :delete_all
   has_many :custom_values, :dependent => :delete_all, :as => :customized
   has_many :custom_fields, :through => :custom_values
   has_and_belongs_to_many :changesets, :order => "revision ASC"