(bug 46418) Claim Diff View for Qualifiers

also done in this change:
- removed unused methods
- updated documentation
- changed method naming scheme

Change-Id: I55cee5597d65ede5d9e3d73a85e55afa75f479a3
(Bug 44940) Add fragment to sitelink

Will only work after merging this
https://gerrit.wikimedia.org/r/#/c/52796/

Change-Id: I62371b1952feb1edf67b2272fc2e109569b9bf23
Merge "(bug 46418) Claim Diff View for Qualifiers"
Merge "(Bug 44940) Add fragment to sitelink"