Rune Magnussen

This is trivial refactoring. There should not be any functional change.

Put ntimed-client in the background once the PLL is stable. Add platform specific back-grounding for UNIX-like systems and make the main client use that to slip into the background once...

Add --help and -h options to show information about other options.

Values affecting mode 1 and 2 of the standard PLL have been converted to tune-able parameters. The min and max values are far apart and may need to be tightened...