- Major refactoring of Account Creation classes (new account resources are now

initialized from a customizable account directory template)

- Disable crashing `verifyDelegator()` code in `allow()` handler

- Add support for HTTP COPY of external resources

- Fix URI encoding in file listing and decoding to get file names

- Fix issue where requesting a different format (e.g. `text/turtle`) of a

JSON-LD resource crashed the server