WinHugs, add /edit flag

[Neil Mitchell]

Hi,

This patch adds an /edit flag.
The behaviour of winhugs on:
winhugs.exe /edit filename.hs

is to fire up whichever editor is configured with winhugs and exit
winhugs. The massive advantage of this is a user can set winhugs /edit
as their file handler for editing haskell files, and as they change
the option in winhugs, it gets changed in their system.

This patch lays the groundwork for a new installer (expect that patch
tomorrow :) )

Neil
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