ENH: show top-rated in front-page

1. create another tab 'top rated' on front page to show submissions based
on score! Filter is created for it
Note: only revision having top Wilson score is showed

2. show all submissions based on score
The above "note" is applicable to [2]

3. create model property in Submission model to get top_revision of the
respective submission
ENH: enable reputation for user profile

1. `reputation` field in user profile is present before but never used!
2. reputation for user profile is done as soon as successful voting is
done
ENH: change toggle arrows in submission

icon-arrow-up --> icon-minus
icon-arrow-down --> icon-plus

icon float right
Used in ".accordion-group" to toggle sections
ENH: moderation settings for thumbs obj

Create `enable_reputation` field in attached objects to thumbs
Voting is possible if field set to True
ENH: show recent votes on profile page

Show user's votes on their profile page.
This tab is visible only for themselves and not others