IPConfiguration.psm1: completely rewritten, uses .NET, much better
Powershell changes: profile and IPConfiguration

-   readline updates. PSReadline is really good now!
-   added Import-X509Certificate function
-   IPConfiguration now has a module manifest, and can be imported
	w/o specifying full path
-   opt/powershell/lib can contain real modules now
-   IPConfiguration completely rewritten to use .NET classes instead
    of parsing the output of `ipconfig /all`