Prevent MacPorts editing .bash_profile

[Jan Stary]

As discussed currently on -users, here is a diff
that stops postflight messing with the user's config
and edits the correspondng parts of installing.xml

	Jan

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From: Jan Stary <hans at stare.cz>
Subject: Re: Prevent MacPorts editing .bash_profile over and over again...
Date: Tue, 21 Mar 2017 21:43:28 +0100
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