Add support of TBytes keyword to torrc for AccountingMax setting (and maybe others)

Happening on Debian 9 with Tor 0.2.9.16 from the standard apt repo. (Sorry, if this is already resolved in newer versions. In that case just close and ignore.)

Syslog output:

Jul 14 10:50:38 systemd[1]: Starting Anonymizing overlay network for TCP...
Jul 14 10:50:39 tor[530]: Jul 14 10:50:39.082 [notice] Tor 0.2.9.16 (git-9ef571339967c1e5) running on Linux with Libevent 2.0.21-stable, OpenSSL 1.1.0k and Zlib 1.2.8.
Jul 14 10:50:39 tor[530]: Jul 14 10:50:39.082 [notice] Tor can't help you if you use it wrong! Learn how to be safe at https://www.torproject.org/download/download#warning
Jul 14 10:50:39 tor[530]: Jul 14 10:50:39.082 [notice] Read configuration file "/usr/share/tor/tor-service-defaults-torrc".
Jul 14 10:50:39 tor[530]: Jul 14 10:50:39.082 [notice] Read configuration file "/etc/tor/torrc".
Jul 14 10:50:39 tor[530]: Jul 14 10:50:39.085 [warn] Unknown unit 'TBytes'.
Jul 14 10:50:39 tor[530]: Jul 14 10:50:39.085 [warn] Failed to parse/validate config: Value 'AccountingMax 5 TBytes' is malformed or out of bounds.
Jul 14 10:50:39 tor[530]: Jul 14 10:50:39.085 [err] Reading config failed--see warnings above.
Jul 14 10:50:39 systemd[1]: tor@default.service: Control process exited, code=exited status=1
Jul 14 10:50:39 systemd[1]: Failed to start Anonymizing overlay network for TCP.

Additionally, please note that /var/tor/log didn't give any hint of this, instead it went to syslog. Suboptimal.

Trac:
Username: tla