the queries for title and pageids are own queries created by the api,
which does not use the GenderCache, that can produce a query per row
Change-Id: I932f8d9d1cfa751dbb6f5237e2de325527d3ff53
LinkBatch can also give subpages to the GenderCache and therefor it is
easier to do it always in GenderCache, than in LinkBatch and Title
Add unit tests for GenderCache
Change-Id: Ia936ff8bb639a197b0b3a8e07c97a66edd57dd10
This reused the gender state of a user on a page. This is helpful for
special pages which shows the group name, because the each group name
used gender, which result in often use.
Change-Id: I8e816f54aaa100c3333e84e19299fd194323341d
