Add a new --accept-properties option so that users can temporarily override
ACCEPT_PROPERTIES on the commandline, without relying on emerge's legacy
behavior of allowing variables to leak in from the calling environment.
A typical usage example for this option would be to use
--accept-properties=-interactive to temporarily mask interactive packages.
With default configuration, this would result in an effective
ACCEPT_PROPERTIES value of "* -interactive".
svn path=/main/trunk/; revision=14501
4 files changed
