autostart off by default except on windows,
fix occasional "vector iterator not dereferencable" assertion with msvc,
fix readlink compile warning on linux build,
use sys/param.h and BSD define instead of __BSD__,
-paytxfee switch
git-svn-id: https://bitcoin.svn.sourceforge.net/svnroot/bitcoin/trunk@130 1a98c847-1fd6-4fd8-948a-caf3550aa51b