Inserted a new config variable 'Stop submitting of new motions'

Normal delegates can not submit a new motion when this is set to true. Inserted also a new template filter to relate to config variables in if-clauses.
#436: New participant field 'title'
Remove participants field 'type'. Use 'group' field instead. Updated csv import, overview table and user detail view
Reorder GroupDetailView code in view.py.
#560 fixed: FormField to choose permissions is too small
Merge pull request #581 from normanjaeckel/Antragsschluss

Inserted a new config variable 'Stop submitting of new motions'
Merge pull request #584 from emanuelschuetze/participants-1

Participants fields: add 'title', remove 'type', use 'groups'
Updated win32 portable build script.

prepare_portable.py:
 Added new site-packages tornado and qrcode.
 Fix incorrect exclude patterns. (by Andy)
 Do not exclude unittest from bundled modules for portable (by Andy)
Updated license files for win32.
requirements.txt: Updated all required packages and current version numbers.
MANIFEST.in: updated file structure
Merge pull request #587 from emanuelschuetze/portable

Updated win32 portable build script.