Version 0.31 2006-08-14 D. Arnold

• remove threads dependency

Version 0.30 2006-04-28 D. Arnold

• broke out from Devel::STrace 0.30 (decoupled to more easily

  support Devel::Psichedb or other debuggers/diagnostics)

• added DESTROY for Devel::RingBuffer and Devel::RingBuffer::Ring
• added global message area
• added per-thread message area
• added per-thread expression-watch area
• converted most mmap'd area accesses to XS/C code