remove group meta tag from variables, they should have their own group
proper group name for variables
remove inventory tag from classes that are covered by variables
add windows roles as class groups (workstation,server,domain controller)
add vm host as class groups (xen,vmware,openvz,oracle)
CFEngine roles as inventory (just policy_server for now)
Merge pull request #1318 from estenberg/feature/inventory-groups

Inventory groups for reporting
bug#2926: make BuildLineArray() dynamic
bug#2926: add type-checking to BuildLineArray()