1.5.4

Improvements since 1.5.3:

- #62: Upgrade HTTP and rsync request logs to INFO
- #64: Patch compilation warnings in clang
- 5464579f5950a70c4c19dd0ab359a2b413ccadfe: Handle HTTP 304 more
  gracefully
- #86: Patch crash during x509_name_equals() (Tentative fix)
- #88: Improve CA/EE certificate identification code
- 3412087fee1903c58013c8cd8706d52320331569: Fix deprecation warnings
  from newer versions of libcrypto
- b027fb4421c0abf2851d3e5551ddd9f944197f24: Remove lots of unnecessary
  stack traces

I'm sorry, but because of time constraints, I've decided to stop
publishing RPM packages during releases, at least until project
development resumes in full. (And assuming people asks for them.)
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