0.3 almost ready -- please test the Mac version!

Here's RC1 for linux for testing:

(link removed, see below)

It contains both 32-bit and 64-bit binaries.

Recent changes:

build-unix.txt:

• Added instructions for building wxBase, which is needed to compile bitcoind.
• The package libboost-dev doesn't install anything anymore, you need to get libboost-all-dev.
• Updated version numbers.

makefile.unix:

• The libboost libraries have removed the "-mt" from their filenames in 1.40. If you're compiling with Boost 1.38 or lower, like on Ubuntu Karmic, you would need to change it back to boost_system-mt and boost_filesystem-mt.