Add functionality to have "tiers" of awards-flairs

[Badspler]

An award-flair might have a version that is within the same category but of a higher ranking to represent higher status.

For example, the top 20 people for a contest may be given a flair, but the top 3 may be given a gold version to show extra value.

-Add some form of tier's into the database structure.
-Add functionality to the website to display and set the appropriate tier of an award-flair that a user has been awarded.
-A different image should be used

[Badspler]

Went down the path of implementing an approach based on a Many:Many relationship (FlairType : possible images) but found that it added a huge amount of complexity in every aspect of the site.

Settled instead on the idea of 'overriding' a flair to use a different image. Requires DB to have a FlairType entered of the 'overrided' flair. Not as elegant of a solution as I originally imagined but will be fit for purpose for now.

(implemented on the 'override' branch.