Add basic implementation for a new meta-tag functionality in the SeltzerCRM system .

    This module is for associating arbitrary "meta data" with member/s.
    This can be useful for making arbitrary groupings of users that have special meaning to you.
    Examples:
    We have one called "Respected", which entitles a member to get a physical key to the building....
    Or one called "Machinist", which means they have passed basic safety assessment to permit them to use our Mill/Lathe.
    It's kinda like an extension to the Permissions system, but for managing things external to SeltzerCRM.