Refixing problem due to redirection after cancelling project update.
Using different targets for 'Cancel' operations on project add and update.
Removing 'News' link if project has no news (COG-505)
Adding lock icon to Home page if private (COG-547).
Fixing problems with redirection after deleting an attachment.
Merge branch 'devel' into luca

Conflicts:
	cog/templatetags/cog_utils.py