Get rid of "firstClaimIndex"/"index" options introduced into jQuery.wikibase.claimlistview, jQuery.wikibase.claimview and jQuery.wikibase.referenceview.

The widgets should not care about their own index (position) within their controlling widgets (if any). Instead, if the controlling code (widgets) add a concept of order to the widgets, those controlling code should manage the index (order).

Version: unspecified
Severity: normal