k-vector todos

[Kvieta1990]

• (bug) NiO with space group R-3m and k=(0,0,3/2) with respect to the conventional cell (hexagonal axes). This one doesn't seem to work correctly: when searching high symmetry points, (0,0,3/2) doesn't appear in the list of potential solutions, which suggests there's a bug in either the conventional/primitive cell conversion or the d-spacing calculation.

• The "HighSymPts & HighSymPaths" option actually searches only HighSymPaths. So we should change the label.

• replacing the tolerance box with a "List top N results" box, that defaults to show the top 10 results (if there are more than 10, and all results otherwise).

• isodistort implementation

• List Avg. \delta(d) and Max. \delta(d) in the table, as well as Avg. \delta(d)/d.