rename dev to testing
add an archive repo
remove the xivo-aastra-3.2.2-SP3 and xivo-aastra-switchboard plugin
remove the Aastra 6751i template

Was only used by the xivo-aastra-2.6 plugin, which has been removed
earlier this year.
update xivo-aastra plugin to support switchboard
remove xivo-snom-switchboard plugin
update xivo-snom plugins to support switchboard
Merge branch '5002-switchboard-opt'