Annotations removal

[jotelha]

This PR addresses #34

[tjelvar-olsson]

@jotelha does it just work out of the box with all the derived concrete implementations of storage brokers (disk, s3, etc)? It looks like it should, but just want to double check.

[tjelvar-olsson]

Approving based on the assumption that it works out of the box with all storage brokers derived from the abstract base class.

[jotelha]

@jotelha does it just work out of the box with all the derived concrete implementations of storage brokers (disk, s3, etc)? It looks like it should, but just want to double check.

Yes, I have tested it for s3, smb, and disk storage broker, and they all work fine.

Eventually, it boils down to the respective storage broker implementing the delete_key method properly,

dtoolcore/dtoolcore/storagebroker.py

Lines 98 to 100 in 00ff72a

	def delete_key(self, key):
	"""Delete the file/object associated with the key."""
	raise(NotImplementedError())

which they should already be doing, since this is used in tag removal as well.