F/bind local file
Added the ability to bind already uploaded files. This is useful if the file is already present and only the link / deduplication features are needed.
It also includes the following:
- clean up and refactoring of some methods that are used (for avoiding copy paste code)
- mention in the credtis
- adding Note on readme entry - that the default hashing method is random not "md5" (as described in the readme)
- adding the ability to list all local files within the 'local' folder.