API load.tsv():  change the default value of delimiter to tab
FIX _plt_utsnd
AMD rej-gui
ENH rej-GUI:  expose linewidth and antialiasing parameters in constructor
ENH rej-GUI:  reorganize butterfly-plot kwargs
ENH rej-GUI:  menu command for toggling plot_range
FIX rej-GUI:  enable Redo/Undo menu commands
AMD set layout
AMD threshold
ENH rej-GUI:  set Y-Axis Limit menu command