* Moves multi reader initialization
* Log error message if not able to open file
* Make keywordCount pure virtual
The base class `RifSummaryReaderInterface` is changed to be abstract and the `keywordCount` is declared as a pure virtual method, therefore the derived classes must implement the method.
This will ensure that all readers are responsible for reporting a keyword count.
* Ensures addresses are created if required
Calls `createAddressesIfRequired` on the summary reader to ensure addresses are created before accessing keyword count.
This prevents potential issues when the addresses haven't been initialized yet.
Magne Sjaastad
Kristian Bendiksen