Merge pull request #2186 from xillibit/k30_bugs3

#2175 When setting "Allow Guests to see Stats link = No" ...
Fix #2102: Joomla 3.x with SEF: you can't switch to other menu items
Merge pull request #2187 from mahagr/master

Fix #2102: Joomla 3.x with SEF: you can't switch to other menu items
Issue #2184 K3.0 Backend: Prune topics option to small
Merge pull request #2189 from 810/master-fix-admin-css

#2184 K3.0 Backend: Prune topics option to small
#2167 Vote Limiting In Polls Doesn't Work (Part 2)
Merge pull request #2194 from xillibit/k30_bugs8

#2167 Vote Limiting In Polls Doesn't Work (Part 2)
Optimize load of attachments in kunena backend