Fix Base.Sys.cpu_info()
fix #4120, close #4139
Merge pull request #4147 from simonster/cpuinfo

Fix Base.Sys.cpu_info()
Merge pull request #4140 from heptal/readbytes

allow readbytes() on Cmd type
allow running perf tests in wine
fix #4137, and cleanup more windows test & distribution stuff
WINDOWS: add echo.bat, so that run() is actually OK
32bit cleanup of arrayops test (probably necessitated to changes to isequal for integer types of different sizes)
update Ubuntu installation notes