spin box height back to default
make steps selector line up with other widgets
consistency in control group labels
fix fstart/fstop setting bug
two-column device controls
fix some device setting case sensitivity
remove dead code
tweak columns and labels
remove arrow key handling (broken by earlier change)
control_util functions were written as MainPanel methods, so make them methods
whitespace
move remaining bit of control_util to its one caller
hotkey_util is MainPanel keyPressEvent, so move it there
remove dead code
move trace and marker control methods into trace_controls
have TraceControls listen to controller events itself
fix mousePressEvent
reindent
use pixel minimum width/height
new trace controls (mock up only)