Unmatched bal model changed to accomodate new recons app - clarec.

With clarec, entry seq number is no longer required and all refs
(internal and external) now come in a single field which clarec
calls details. The has been mapped to this app's clarec_details
field.
Broke clarec unmatched records into its own model with APIs
Added fields to unmatched clarec to know if we have uploaded record
before.

This is necessary because I am not sure yet what unique field/fields
will help me to know what have records I have uploaded earlier.
Unmatched clarec now in tab panes for upload and display.
clarec can be uploaded and viewed from front end.
Merge branch 'master' into develop