[krbdev.mit.edu #5612] NIM feature request - cmdline option to open GUI

[Jeffrey Altman via RT]

As discussed on the kfwdev mailing list I propose the following changes
to the existing behavior:

(1) Add --show and --hide command line options to netidmgr.exe.  These
commands will cause a previously running NIM to either show or hide its
application window.

(2) When a second instance of netidmgr.exe is executed without
command-line parameters, it should trigger the default tray action in
the first instance.  The default tray action is configurable by the user
to either mean "obtain new credentials" or "show/hide" the application
window.  By making this change, a user that opens a shortcut to a second
instance of NIM will trigger the same action as if she clicked on the
tray icon with the first mouse button.