Vuln stat filter

[nastasi-oq]

Add persistent filters (using cookies) surviving to page changes. Tests are running here: https://ci.openquake.org/job/zdevel_oq-platform/472/ Pay attention during installation to config file changes:

--- a/openquakeplatform/openquakeplatform/local_settings.py.template
+++ b/openquakeplatform/openquakeplatform/local_settings.py.template
@@ -207,8 +207,13 @@ PYCSW = {
     }
 }

-INSTALLED_APPS = (
+STANDALONE_APPS = (
+    'openquakeplatform_ipt',
+    'openquakeplatform_taxtweb',
+    'openquakeplatform_building_class',
+)

+INSTALLED_APPS = (
     # Apps bundled with Django
     'django.contrib.auth',
     'django.contrib.contenttypes',
@@ -284,16 +289,11 @@ INSTALLED_APPS = (
     'openquakeplatform.hazus',
     'openquakeplatform.hrde',
     'openquakeplatform.irv',
-
-    'openquakeplatform_ipt',
-    'openquakeplatform_taxtweb',
-    'openquakeplatform_building_class',
-
+) + STANDALONE_APPS + (
     # gemecd
     'openquakeplatform.weblib',
     'openquakeplatform.econd',
     'openquakeplatform.gemecdwebsite',
-
 )

 MIDDLEWARE_CLASSES = (
@@ -402,3 +402,5 @@ AVATAR_GRAVATAR_DEFAULT = 'http://ftp.openquake.org/oq-platform/oq-avatar-40.png
 # For IPT we need a path where store temporary files
 # FILE_PATH_FIELD_DIRECTORY = 'data/'
 FILE_PATH_FIELD_DIRECTORY = '%(datadir)s'
+
+TIME_INVARIANT_OUTPUTS = False