[TEST] fix another rounding issue
[STORE] Turn unexpected exception into CorruptedIndexException

Today if we run into exception like NumberFormatException or IAE
when we try to open a commit point to retrieve checksums and calculate
store metadata we just bubble them up. Yet, those are very likely index
corruptions. In such a case we should really mark the shard as
corrupted.
[Version] Add Version 1.4.0-Beta
[VERSION] Added Version [1.5.0]