howto replace old default macports.conf with latest

[Jeremy Lavergne]

> The binary build thread made me realize my 2 year old default macports.conf is hopelessly out of date.  A quick search of FAQ, Guide, etc. didn't turn up any advice on how best to update it, and I expect that just replacing it with the latest default may not be it.  If I replace it, do I need to force an update of all installed ports, or what? I'm concerned that just replacing it will break things, and if I need to start from scratch, I'd rather know that up front. Am I worrying needlessly? Any pointers?

The notable changes on a half year old (2011-04-14) macports.conf:
 * macportsuser changed from root to macports
 * portarchive-related settings have changed: you can't disable the mode and the type now defaults to tbz2
 * rsync_dir has changed to reflect our use of a tarball'd portfile directory (release/base to release/tarballs/base.tar)

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