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OK - pretty easy to add the reference. Edit the .csproj file in a text
editor, and add:-

<Reference Include="System.Management.Automation" />

to the relevant section. But it would be nice to have the file back in a
browsable folder location.

BTW: on the subject of editing files in a text editor, I've found (not doubt
others have too) that if you edit a version 8 .sln file, you have to delete
the blank first line that VS erroneously put there when the solution was
created. If you don't do this, it won't be recognised as a proper .sln file
anymore. Hope this is fixed in SP1.