Create data listing pages for categories

One could create, for each category, either on the category itself, or on a page named "List of {{{category}}}s", a page with the following content:

``` wiki
{{#ask:[[Category:Compound]]
 |?HaspKa
 |?HasDOIUrl
 |format=table
 |link=all
 |headers=show
 |searchlabel=... further results
 |class=sortable wikitable smwtable
 |sort=HaspKa
 |limit=250
}}
```
