Lowrisc with dual Rocket/Ariane support and X-windows

Taking into account all the SystemVerilog programmers out there, it was inevitable there would be a demand for a SystemVerilog version of LowRISC. This is a transitional release supporting both Rocket (from UC Berkley) and Ariane (from ETHZ). Supported boards are nexys4_ddr and GenesysII. In conjunction with an external VGA monitor and PMOD-BT adapter, both boards support X-Windows with Bluetooth mouse and keyboard. In addition, the GenesysII board supports 1000BaseT Ethernet and 1GByte of RAM available to Linux.