fix multicourse; fix bug in I4xSystem - self.filestore not set when

filestore not None.  mitxhome.html now properly automatically lists
all courses given in settings.COURSE_SETTINGS.  mitxhome now served
from multicourse.views.  optioninput.html was missing; fixed. cleaned
up access to request.session for coursename in courseware/views.py

djangoapps/multicourse/multicourse_settings.py

@@ -42,6 +42,11 @@ else:						# default to 6.002_Spring_2012
 #-----------------------------------------------------------------------------
 # wrapper functions around course settings
 
+def get_coursename_from_request(request):
+    if 'coursename' in request.session: coursename = request.session['coursename']
+    else: coursename = None
+    return coursename
+
 def get_course_settings(coursename):
     if not coursename:
         if hasattr(settings,'COURSE_DEFAULT'):

djangoapps/multicourse/views.py

@@ -1 +1,24 @@
-# multicourse/views.py
+import datetime
+import json
+import sys
+
+from django.conf import settings
+from django.contrib.auth.models import User
+from django.core.context_processors import csrf
+from django.core.mail import send_mail
+from django.http import Http404
+from django.http import HttpResponse
+from django.shortcuts import redirect
+from mitxmako.shortcuts import render_to_response, render_to_string
+
+import courseware.capa.calc
+import track.views
+from multicourse import multicourse_settings
+
+def mitxhome(request):
+    ''' Home page (link from main header). List of courses.  '''
+    if settings.ENABLE_MULTICOURSE:
+        context = {'courseinfo' : multicourse_settings.COURSE_SETTINGS}
+        return render_to_response("mitxhome.html", context)
+    return info(request)
+