GNUnet 0.6.6 released

This release adds support for Win32 systems.  The setup binary is at
http://ovmj.org/GNUnet/download/win/Setup-0.6.6.exe

Other changes include:
* download manager for gnunet-gtk (!)
* various OS X bugfixes
* resolved big-endian problems with CRC32
* support for the latest pthread versions
* build-in log rotation (mostly for Win32 users)
* working progressbar for large directories (sorry, no files > 2 GB yet)

0.6.6 should be fully compatible with 0.6.5, so updating should be trivial.

Oh, and it should be said that Nils did most of the coding and other work for 
this release -- I'm just writing the announcement. :-) So a big thanks to 
Nils at this point is in order.

Christian