added SetBitcoinAddress and GetBitcoinAddress methods on CScript,
critsect interlocks around mapAddressBook,
added some random delays in tx broadcast to improve privacy,
now compiles with MSVC 8.0
git-svn-id: https://bitcoin.svn.sourceforge.net/svnroot/bitcoin/trunk@60 1a98c847-1fd6-4fd8-948a-caf3550aa51b
better error dialog box if try to spend already spent coins,
got rid of unused notebook with only one tab on main dialog,
nicer looking About dialog,
resize About dialog better on linux
git-svn-id: https://bitcoin.svn.sourceforge.net/svnroot/bitcoin/trunk@55 1a98c847-1fd6-4fd8-948a-caf3550aa51b