Fix off-by-one error in Beast-format input.

[mutability]

This would mangle messages if the first byte of a message ended up as the last byte returned by a read() call - it would read beyond the end of the buffer, decide the message was damaged, and then run off into the message data looking for a new delimiter. Sometimes that would work (only dropping one message), but sometimes it would run into data that happened to look like a message start but actually wasn't, and then try to interpret that, leading to completely bogus message data being read.

(cherry picked from commit e7d7fd549ceede7350bd2c72b61265173d1f0d2d)

[steel101]

just inserted the code in to my fork it has this and plane count and plane count in title and signal and settings page and lots more including almost all pull request here demo at http://bitropy.net:8080