Begin building the framework to rename accounts. A pile of crap right now.
Factor out common code that can be used to mv (rename) accounts. Separate Plugin/RmPlugin modules.
Switch from constants to variables in the Configuration module. This should keep Ruby from complaining when users override the defaults. Change the local config path from $HOME/.mailshears.conf to $HOME/.mailshears.conf.rb so that Ruby will actually load it.
Restructure the lib directory to avoid name collisions.