Update port reinstallation instruction on wiki

[Jimmy Yuen Ho Wong]

Currently, the Migration 
<https://trac.macports.org/wiki/Migration#ports> guide on the wiki 
denotes a 6-step process to restore ports after an upgrade, one of which 
requires the user to download a script that hasn't worked properly for a 
few years now (doesn't restore variants and ignore platform and arch). I 
propose a much simpler instruction like so:

 3. *Reinstall your ports*
     1. Save the list of installed ports:

        port echo requested | sed -E s/@[^\+]+//g > requested.txt

     2. Uninstall all installed ports:

        sudo port -f uninstall installed

     3. Run a regular clear out of your installation:

        sudo port reclaim

     4. Restore requested ports:

        sudo bash -c 'cat requested.txt | xargs port -v install'

This is much simpler, no need for notes or warnings or editing the text 
files.


Jimmy Yuen Ho Wong
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