TODO list for Perl module Handel

    - add tests/code for Handel::Cart XSP Taglibs
    - complete pod for all current modules
    - start work on Handel::Order part of framework
    - find translation volunteer other than Google translate
    - clean up cart test variable names
    - add additional cart restore w/filter tests for multiple saved carts
    - figure out a centralized config scheme, possibly using XS/Handel.pm
    - add max quantity check to cart constraint
    - devise method for overriding constraints