Adding dbfpy3 init.py

I had apparently missed the dbfpy3 init file when committing dbfpy3.
Adding dbfpy and dbfpy3 to setup.py's package list
Switching test order of formats

Putting dbf format testing ahead of TSV.  In some of my tests with
numeric DBF files, I encountered an issue where the ASCII horizontal
tab character (0x09) would appear in a numeric DBF.  Because of the
order of tabular format imports, though, format detection would
recognize it as a TSV and not as a DBF.
Adding my name to AUTHORS.
Adding a DBF property to tab lib core

Documentation includes examples on how to explicitly load a DBF
straight from a file and how to load a DBF from a binary string.  Also,
how to write the binary data to a file.
Adding DBF format notes to README