A ByteSink that sends output in two directions
A ByteSink that remembers the last N lines of output to it
A Panel that displays a LineTailByteSink
Fixes to OverflowableCharBufferByteSink
Test LineTailByteSink and OverflowableCharBufferByteSink
Add a logging panel (on 'l' -- moved heatmap to 'h')
Small cleanups.  Also log simulation dir name
Dim out logger border
Possibly fix DHS 'top edge asymmetry' issue?
Saner TeeByteSink::CanWrite
Merge pull request #30 from DaveAckley/master

Logging window mostly