For heavy users loading dashboard is slow (several seconds) since
they are set on many (> 100) changes. We set 25 limit to sections
and 10 for CCed so dashboard query load under 1s.
This also adds information about number of changes in section
title and there is still option to click on section title to see
all changes with paging.
Users can override this with their own custom dashboards.
Bug: Issue 11705
Change-Id: Ief9afa4b5a107520b3337017dddcb462a2ab9626
497380f1df