PhoenixMiner 5.0b

Added support for mining with 4 GB AMD cards beyond the DAG epoch 350. Depending on the OS and driver versions, you will be able to use 4 GB AMD cards until epoch 372-373 under Windows, and 380 under Linux.
Added new -dagrestart command-line option to work around the problems with DAG allocation on 4 GB AMD cards under some driver versions. See Readme.txt for more information.
Added support for latest AMD drivers 20.4.2 under Windows and 20.10-1048554 under Linux
Many other small improvements and fixes