Merge back from sdcc-240
Fixed the sz80 location (again)
Tidied up the build, install, and regression tests.
* sim/ucsim/gui.src/serio.src/main.cc: Fixed unconditional use of
Added limited run support
* device/lib/z80/printf.c: Changed emitter to volatile to work
* device/lib/z80/printf.c (sprintf): Added.
Added