Bibarchive: DB API

* Exceptions are now generalised, return false upon fail along with
a stack trace.

* Database_Connection and Database_Access __init__() functions
have been removed...

...now the first function in each (open() and access()) must be
run upon initialisation to instantiate variables. This is so that
they can return false if the connection fails.
Bibarchive: Bagit API

* Creates a bagit given a path to a dir

* Validates a bagit given a path to a dir