Next/Previous Day/Month links don't work in calendar

[John Hampton]

Thanks to Arc for the heads up

*cough* lazy whining bastard *cough*

Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/trac/web/modpython_frontend.py", line 206, in handler
    dispatch_request(mpr.path_info, mpr, env)
  File "/usr/lib/python2.4/site-packages/trac/web/main.py", line 139, in dispatch_request
    dispatcher.dispatch(req)
  File "/usr/lib/python2.4/site-packages/trac/web/main.py", line 107, in dispatch
    resp = chosen_handler.process_request(req)
  File "build/bdist.linux-i686/egg/tBlog/web_ui.py", line 173, in process_request
  File "build/bdist.linux-i686/egg/tBlog/web_ui.py", line 265, in _generate_blog
  File "build/bdist.linux-i686/egg/tBlog/web_ui.py", line 299, in _generate_calendar
IndexError: list index out of range

[John Hampton]

(In [725]) * Fix for list index bug in calendar, closes #329, #345

• Added permisison check to new post. Still have a slight issue with the error not showing the permisison needed
• Smal UI tweak to tags listing