Static analysis updates

[figaro]

Autopep8 mostly adjusts indentation. Manual addition of some docstrings, a classifier and a modest increase to the version number.

Two issues which I want to highlight:

1. Typo in source:tracdbftsplugin/trunk/tracdbfts/api.py​

   Line
   533	cursor.execute("DROP TRIGGER IF EXISTS dbfts_insert")
   534	cursor.execute("DROP TRIGGER IF EXISTS dbfts_insert")
   535	cursor.execute("DROP TRIGGER IF EXISTS dbfts_delete")

2. ​Bandit speaks of ​insecure hash function use also in api.py, and perhaps you can suggest an alternative?

   Line
   602	def _build_hash(*values):
   603	def to_b(value):
   604	if isinstance(value, _inttypes):
   605	return b'%d' % value
   606	if isinstance(value, bytes):
   607	return value
   608	if isinstance(value, unicode):
   609	return value.encode('utf-8')
   610	raise ValueError('Unrecognized value %r' % type(value))
   611	d = hashlib.sha1()
   612	d.update(b'\0'.join(to_b(value) for value in values))
   613	return base64.b64encode(d.digest()).rstrip(b'=')

[figaro]

Diff -u of tracdbftsplugin/trunk