Rather than inventing its own page token the PageIssues
schema will rely on the standard page token.
In future when I9bb18d47e36d2d99d812e5b47ea9516d3dff3a16 is
merged this will mean that PageIssues and ReadingDepth have
consistent page tokens.
Bug: T201124
Change-Id: I19fea41e04cd792423ea9d41a673563418b69726
The CleanupOverlay is moved to Minerva and renamed the
IssuesOverlay to be consistent with current terminology
The new IssuesOverlay is defined inside the module
skins.minerva.scripts to which it now belongs.
Additional changes:
* various file renames
* overlay-cleanup renames overlay-issues
* cleanuptemplates renamed issues.js
* Add a test stub file to avoid the need to load templates inside
the test environment
After this change, I75f47622d94e504688e04dfb2892540473817053
should be merged to avoid confusion.
Change-Id: I08945a324a6b878abe56efed1e988466085b3018
jdlrobson