Sync with latest Instiki trunk. Changes:

1) Upgrade Rails to 1.2.3
2) Revert RedCloth to previous version (who %#$@ cares?)
3) Preserve the Rails Security fix  to vendor/rails/actionpack/lib/action_controller/caching.rb from Revision 80.

vendor/rails/actionpack/lib/action_controller/base.rb

@@ -539,7 +539,7 @@ module ActionController #:nodoc:
       end
 
       def session_enabled?
-        request.session_options[:disabled] != false
+        request.session_options && request.session_options[:disabled] != false
       end
 
     protected

vendor/rails/actionpack/lib/action_controller/cgi_process.rb

@@ -1,6 +1,7 @@
 require 'action_controller/cgi_ext/cgi_ext'
 require 'action_controller/cgi_ext/cookie_performance_fix'
 require 'action_controller/cgi_ext/raw_post_data_fix'
+require 'action_controller/cgi_ext/session_performance_fix'
 
 module ActionController #:nodoc:
   class Base

vendor/rails/actionpack/lib/action_controller/routing.rb

@@ -344,10 +344,10 @@ module ActionController
         # the query string. (Never use keys from the recalled request when building the
         # query string.)
 
-        method_decl = "def generate(#{args})\npath, hash = generate_raw(options, hash, expire_on)\nappend_query_string(path, hash, extra_keys(hash, expire_on))\nend"
+        method_decl = "def generate(#{args})\npath, hash = generate_raw(options, hash, expire_on)\nappend_query_string(path, hash, extra_keys(options))\nend"
         instance_eval method_decl, "generated code (#{__FILE__}:#{__LINE__})"
 
-        method_decl = "def generate_extras(#{args})\npath, hash = generate_raw(options, hash, expire_on)\n[path, extra_keys(hash, expire_on)]\nend"
+        method_decl = "def generate_extras(#{args})\npath, hash = generate_raw(options, hash, expire_on)\n[path, extra_keys(options)]\nend"
         instance_eval method_decl, "generated code (#{__FILE__}:#{__LINE__})"
         raw_method
       end
@@ -1238,7 +1238,7 @@ module ActionController
         # drop the leading '/' on the controller name
         options[:controller] = options[:controller][1..-1] if options[:controller] && options[:controller][0] == ?/
         merged = recall.merge(options)
-    
+
         if named_route
           path = named_route.generate(options, merged, expire_on)
           if path.nil? 

vendor/rails/actionpack/lib/action_controller/test_process.rb

@@ -288,11 +288,11 @@ module ActionController #:nodoc:
     end
 
     def [](key)
-      data[key.to_s]
+      data[key]
     end
 
     def []=(key, value)
-      data[key.to_s] = value
+      data[key] = value
     end
 
     def update