Use OTTransactionType::SetLoadInsecure() instead of manually setting m_bLoadSecurely.

SetLoadInsecure() exists for this purpose.
Cleanup in OTLedger::UpdateContents().

* Variable bSavingAbbreviated set redudantly.
* Removed nPartialACTUALCount that is only used for an assert that
  cannot fail.
* Make nPartialRecordCount depend on bSavingAbbreviated, instead of
  replicating the logic for both.
Merge pull request #404 from benma/develop

Cleanup in OTLedger::UpdateContents()