Bugs
* the file with the lines "M101 P1 Q2" "M2" won't load, but it should

Wishlist items
* pick better Z-buffer extents using machine limits from inifile
* messages when paused (or about to pause) should offer the opportunity to
  unpause in the dialog
* make step button work from program beginning (if possible?)
* Way to show diameter of drills, width of cuts (poor-man's CSG preview)
* Way to turn off lines already plotted in live preview
* context menu on code area, options "copy", "start at this line"
* make the view follow the cone around
* more built-in help
* for live plot, G0 vs G1 should be different colors

Missing dialogs/subwindows from xemc:
* tool list editor (at least display?)
* axis editor
* coordinate systems
* calibration, logging, variables, diagnostics

Missing keys from xemc:
0..9    Feed override       1..5 select axes in AXIS
Alt-T   edit tool
Alt-P / Alt-S Logging

Functions and keys from other frontends that won't be implemented:
, / .   jog speed           feed override affects jog speed
V       validate            files are validated at load-time
