Using .NET to create a temp file

[marco.shaw]

Just a little something from .NET to create a temp file.  One is *usually* guaranteed that they can write to this temp directory on any local system. 

$tmp_file=[iO.Path]::GetTempFileName()

Certain actions with out-map can require writing to a temp file.

Using this with 'out-map -createlabellinkfile' does cause a minor 'snag' though...  -createlabellinkfile will prompt the user if they want to overwrite an existing file.  So one can't generate the file above, then use -createlabellinkfile without the end user getting a prompt to accept the over-write.