Changes

*[https://cpcrulez.fr/applications_util-zexall.htm ZEXDOC & ZEXALL] Z80 instruction set exerciser

*[https://www.cpc-power.com/index.php?page=detail&num=9627 Official Amstrad Plus diagnostics cartridge]

*[http://www.winape.net/downloads.jsp Plus Test] CPC/CPC+ Emulator test suite (including Instruction and Interrupt timing tests)