Log Message:
Update to 0.91:

ClamAV 0.91 is the first release to enable the anti-phishing technology
in default builds. This technology combines heuristics with special
signatures and provides effective protection against phishing threats.
Other important changes and add-ons in this version include:

- unpacker for NSIS (Nullsoft Scriptable Install System) self-extracting
  archives
- unpacker for ASPack 2.12
- new implementation of the Aho-Corasick pattern matcher providing
  better detection for wildcard enabled signatures
- support for nibble matching and floating offsets
- improved handling of .mdb files (fixes long startup times)
- extraction of PE files embedded into other executables
- better handling of PE & UPX
- removed dependency on libcurl (improves stability)
- libclamav.dll available under Windows
- IPv6 support in clamav-milter
- many other improvements and bugfixes