Comment fix.
Not selecting a peak list file also vetos the event so the cell is not editable.
The 'Rx peak lists' column name is no longer plural.
Added a title and nicer spacing for the relaxation peak lists GUI element.
Removed some unused variables.
Double clicking on the peak list cells in the Rx frames now runs openfile().
Spacing fix.
Capitalisation fix.
Redesigned sync_ds() to handle the new wx.grid.Grid() object.
Partially reverted r12870 as the commenting out of link_data() broke the loading of the relax state!