Made ls display amount of dirs/files

Self explanatory
This is for linux purists

...
Fixed typo

derp
Added another try-catch to the native lib version check in case rights settings get weird (reported on MCF).
Merge https://github.com/Wuerfel21/OpenComputers
Changed option flag for ls to display file and dir count to an unused one and made it read like dir in Windows (which is what it's meant to mimic, after all).