Release Notes Abra

Version 3.12.6
Improvement
* [ABRA-690] - Harden ABRA with XML External Entity Prevention
* [ABRA-695] - xBRL Formula performance: empty independent fact variable without fallback cannot produce an evaluation

Bug
* [ABRA-694] - xBRL Formula: implicit filtering for location aspect procuces inconsistent results
* [ABRA-692] - xBRL Formula: ConcurrentModificationExeption on tuples evaluation
* [ABRA-689] - iXBRL: ignore text nodes when validating escaped non numeric for html children
* [ABRA-693] - xBRL Formula: exception on assertion with only general variables