Oracle compatibility: Shortened datasource names to fit undef Oracle req...

...uirements

This will allow Oracle-based installations to upgrade to the new, shorter table names of v1.3 and go back to the standard code.

* `ajaxrating_hotobject -> ar_hotobject`
* `ajaxrating_votesummary -> ajaxrating_vs`

[Note to Mark: This commit never made it from our internal branch into the code that you merged earlier. Without it, the Oracle compatibility is incomplete and will fail.]