Change 4165

Barrie Slaymaker
Request Review
- VCP::Source::null now returns /dev/null or NUL for files
- VCP::Dest::p4 now watches is_branch_rev() to detect branches
- t/99p4_label_branch_rev_1.t reproduces a bug reported by
  Matt Attaway < matt at perforce com >
2 edited 1 added 0 deleted
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