GitLab

Use /sbin/parted to call parted. This might need to be improved with automatic detection of the parted location later

Switch kernel builds away from using xargo

See merge request !1255

Use cargo's 'build-std=core,alloc' instead.

Also: Cargo is now given the complete path to the target specific JSON file.
This forces the use of the JSON file (the file is silently ignored if
the target in question was built into the rust compiler).