oldserver+newclient is not supported, so retain 2.0.54 by splitting
into 2.0 and 2.1 subdirecties and using "@option is-branch".
based on a submission from jirib at devio.us, i twweaked it quite a bit though
Burp is a network backup and restore program. It attempts to reduce
network traffic and the amount of space that is used by each backup,
and uses VSS (Volume Shadow Copy Service) to make snapshots when
backing up Windows computers.
ok/feedback rsadowski@/ajacoutot@
