Use fork names instead of numbers in the file names for additional

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: 5f853c655663bf829c02895de2b445a5f3caa24b
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2008-10-06T14:13:17Z
Releases: 8.4.0
Use fork names instead of numbers in the file names for additional
relation forks. While the file names are not visible to users, for those
that do peek into the data directory, it's nice to have more descriptive
names. Per Greg Stark's suggestion.

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