Case insensitive tags

Title
Case insensitive tags

Short, concise description of the idea
Make the tags case insensitive or at least make it a configurable option.

Full description of the idea
Make tags case insensitive. For example - 'Fun', 'fUn' and 'fuN' are three diferent tags now. If tags are case insensitive, these will be all the same.

• Reduced number of tags
• Simplified tag processing
• Should prevent the miss-taging introduced by wrong case

• There will be no way to distinct from two tags by case
• Probably a more deep code change if it is implemented as a configurable option

• The code should treat all tags as upper or lower case words, so the URL livejournal.com/users/user/tag/Test and livejournal.com/users/user/tag/tESt should return the same set of journal entries.
• The other option is to make it a configurable option, somewhere in the user profile.