[tor-reports] Karsten's May 2015

[Karsten Loesing]

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TorCloud
 - Announced discontinuation of Tor Cloud, then took it offline.

CollecTor
 - Fixed CollecTor to no longer contain lots and lots of duplicate
bridge descriptors in its recent/ directory (#12676).
 - Recompressed CollecTor tarballs to 90% of their original size using
`xz -9e` instead of `xz -9` (#11788).
 - Started discussing how to sanitize bridge descriptors containing
ed25519-related fields (#16227).

Onionoo
 - Started discussing switching from the current in-memory search
index to a database for better extensibility (#15844).

metrics-lib
 - Added a new feature to synchronize descriptors or descriptor
tarballs from CollecTor via https to a local directory (#16151).
 - Started thinking about better and more uniform exception/error
handling (#16225).

Sponsor R
 - Attended weekly IRC meetings.
 - Made plans for setting up a permanent Torperf instance to measure
hidden service performance.
 - Visualized statistics like "introductions received per introduction
circuit" and "introduction circuit lifetime in hours" (#15744).

Sponsor O
 - Attended bi-weekly IRC meetings.
 - Worked towards an extension of the upstream contract from May 31 to
June 30, 2015.
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