More obscure GL related issues (this will take a version or two more to get solid).

Firstly, handling of GL Records for unit sale on road costs where on road cost is being borne by the dealership was not constructed correctly, now fixed.

Importantly, I found a bug where system was allowing unbalanced postings to be written into the database.  Made necessary corrections and fixes, respectively damaged postings. Damaged postings only occur under rare circumstances, due to incorrect database transaction management.