Added new global class for working with popularity PopularityDefs.
Changed the display of the popularity icons.
0 = icon 0
1-7 = icon 1
8-15 = icon 2
16-24 = icon 3
25-34 = icon 4
>34 = icon 5
This can be changed in PopularityDefs::icon.
git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@3933 b45a01b8-16f6-495d-af2f-9b41ad6348cc