Version 4.3.4

Ticket #12 resolved. This supports what we'll call RECFM=N processing.

It will handle EBCDIC files that lack BDW/RDW words at the start of blocks and records.

It uses a very large buffer, computes the "Occurs Depending On" record size, then does an unmet of the unused bytes at the end of the buffer. It's slower than processing a file with proper RDW/BDW words from the mainframe filesystem.