HistogramPlot needs List, Copy, and Log command support

The HistogramPlot has a few buttons whose functionality is not yet implemented. There are three commands left:

List:

In IJ1 this command copies the histogram into a two column text table as a results table. The 1st column contains calibrated data values and the second column contains counts.

Copy:

In IJ1 this command copies the histogram into a two column text table on the clipboard. The 1st column contains calibrated data values and the second column contains counts.

Log:

In IJ1 this command displays additional data on the chart. The data series is displayed on a log scale in back and the linear scale in front.

Migrated-From: http://trac.imagej.net/ticket/1855

Locate the HistogramPlot implementation and its existing button or command handlers first. Review the IJ1 behavior described for List, Copy, and Log, then verify that all three commands produce the specified table, clipboard, and overlaid log-scale data behavior.

Written by the indexing model from the issue text.