Onionbalance

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- Allow migration from Tor to Onionbalance by reading tor private keys directly
using the 'key' directive in the YAML config file. Also update
`onionbalance-config` to support that.
- Improve `onionbalance-config` for v3 onions. Simplify the output directory
(and change docs to reflect so) and the wizard suggestions.

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- Initial support for v3 onions!

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- Fix a bug which could cause descriptor fetching to crash and stall if an
old instance descriptor was retrieved from a HSDir. 64
- Minors fixes to documentation and addition of a tutorial.

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- Add functionality to reconnect to the Tor control port while OnionBalance is
running. Thank you to Ceysun Sucu for the patch. 45
- Fix bug where instance descriptors were not updated correctly when an
instance address was listed under multiple master service. 49
- Improve performance by only requesting each unique instance descriptor
once per round, rather once for each time it was listed in the config
file. 51
- Fix bug where an exception was raised when the status socket location did
not exist.
- Improve the installation documentation for Debian and Fedora/EPEL
installations.

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- Remove unicode tags from the yaml files generated by onionbalance-config.
- Fix bug resulting in invalid instance onion addresses when attempting to
remove the ".onion" TLD. 44

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- Log error when OnionBalance does not have permission to read a private key. 34
- Fix bug loading descriptors when an address with .onion extension is listed
in the configuration file. 37
- Add support for connecting to the Tor control port over a unix domain socket. 3