With this version, the user interface and organization of code will be pretty stable for a while. In future updates, I'll concentrate on implementing the Multi-Taper method, fixing some problems with the Lomb methods for XY data, and better noise model choices and confidence intervals.

I think I've caught all the bugs I introduced while reorganizing things, but until I've gotten feedback from other users I'll leave this as a beta release.

popup sort options for wave selectors
put buttons in controlbar for help and showing/hiding wave selection
allow switching position of data series/spectrum plots
SSA support will be put in future SSA package
Better ticks for reciprocal axis when linear frequency/period is selected
padding to get desired frequency resolution