IO priority on portage and it's subprocesses.
svn path=/main/trunk/; revision=11192
portage-2.2
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+* Add PORTAGE_IONICE_COMMAND setting for make.conf which is called to adjust
+ IO priority on portage and it's subprocesses.
* Add link level dependency awareness to emerge --depclean and --prune actions
in order to protect against uninstallation of required libraries.
* Add emerge --jobs and --load-average options which specify behavior