enabled -O2 in makefile.unix,
boost removed -mt from their library names in 1.40,
updated bitcoin icon,
hashmeter,
generated and hashmeter log entries
-- version 0.2.13

git-svn-id: https://bitcoin.svn.sourceforge.net/svnroot/bitcoin/trunk@86 1a98c847-1fd6-4fd8-948a-caf3550aa51b